Battery device and electric appliance

Abstract

Embodiments of the present disclosure provide a battery device and an electric device. The battery device comprises a battery cell group and a box assembly. The battery cell group comprises a plurality of battery cells stacked along a first direction. The box assembly is configured to define a receiving cavity. The battery cell group is arranged in the receiving cavity. The box assembly comprises two side beams arranged oppositely along the first direction. The side beam comprises a first plate configured to constrain the battery cell group and a support structure abutting against the first plate from a side of the side beam away from the battery cell along the first direction. The first plate is a fiber composite plate. In the battery device and the electric device, the first plate is a fiber composite plate. Compared with a metal structure, the weight of the box assembly can be reduced, and the energy density of the battery device can be improved. Further, the support structure abuts against the first plate from the side of the side beam away from the battery cell along the first direction. In this way, the weight is reduced, and the anti-deformation capability of the side beam can meet the demand.

Description

Technical Field

[0001] The embodiments of this application relate to the field of battery technology, and more particularly to a battery device and an electrical appliance. Background Technology

[0002] Batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are increasingly being used in the field of energy storage.

[0003] In electrical devices equipped with battery devices, the battery device typically accounts for a significant portion of the total weight, thus meeting the lightweight requirements of these devices. Therefore, how to improve the structural strength of the battery device while reducing its weight and increasing its energy density to meet the lightweight requirements of electrical devices has become an important research direction in this field. Utility Model Content

[0004] In view of this, the embodiments of this application aim to provide a battery device and electrical equipment with high structural strength, low weight, and high energy density.

[0005] A first aspect of this application provides a battery device, the battery device comprising: a battery cell assembly including a plurality of battery cells stacked along a first direction; a housing assembly for defining a receiving cavity, the battery cell assembly being disposed in the receiving cavity; wherein, the housing assembly includes two side beams disposed opposite to each other along the first direction, the side beams including a first plate and a support structure, the first plate for constraining the battery cell assembly, the support structure abutting against the first plate from a side away from the battery cells along the first direction, the first plate being a fiber composite material plate.

[0006] In this embodiment, the side beam of the housing assembly includes a first plate and a support structure. The first plate is used to constrain the battery cell pack, and the first plate is a fiber composite material plate. Compared with a metal structure, this reduces the weight of the housing assembly, thereby increasing the energy density of the battery device. Furthermore, the support structure abuts against the first plate from the side opposite to the battery cell along a first direction. In this way, the support structure and the first plate can jointly provide support force, thereby ensuring that the deformation resistance of the side beam meets the requirements while reducing weight.

[0007] In some embodiments, the support structure includes a first support body having a support plate facing the first plate, the first direction being the thickness direction of the support plate, and the support plate abutting against the first plate along the first direction.

[0008] In this embodiment, the first support body is configured to include a support plate, which can improve the contact area between the first support body and the first plate and the uniformity of force distribution, thereby helping to further improve the deformation resistance of the side beam and meet the requirements for resistance to expansion force.

[0009] In some embodiments, the housing assembly includes a first wall, two side beams connected to opposite ends of the first wall along the first direction, a battery cell supported on the first wall, and the first support further includes an extension plate connected to the support plate, the extension plate being connected to the side of the support plate facing the battery cell and extending along the first direction, the extension plate being connected to the first wall and projected onto the same projection plane along the thickness direction of the first wall, the projection of the extension plate overlapping with the projection of at least a portion of the battery cell.

[0010] In this embodiment, the extension plate can, on the one hand, jointly support the battery cells with the first wall, enhancing the support capacity of the housing assembly; on the other hand, the extension plate helps to balance the force on the support plate, reducing the probability of the support plate tilting and deforming, thereby improving the deformation resistance of the side beam and meeting the expansion resistance requirements of the side beam.

[0011] In some embodiments, the first support further includes a reinforcing structure disposed on the side of the support plate opposite to the battery cell along the first direction.

[0012] In this embodiment, by providing a reinforcing structure on the side of the support plate away from the battery cell along the first direction, the structural strength of the support plate can be further improved, thereby enhancing the deformation resistance of the side beam.

[0013] In some embodiments, the side beam includes a second plate located on the side of the support plate opposite to the first plate along the first direction, and the support structure further includes a second support body located between the support plate and the second plate, the second support body including a foam layer; or, the second support body is configured as a fiber composite shell with an opening at at least one end facing the support plate.

[0014] In this embodiment, the second support, in conjunction with the first support, further enhances the structural strength and deformation resistance of the side beam. Furthermore, the second support formed by the foam layer can further mitigate impact, providing excellent support and being lightweight, facilitating the weight reduction of the box structure. The second support formed by the fiber composite shell possesses good structural strength and can also provide thermal insulation and corrosion resistance depending on the matrix phase; the open cavity further reduces weight, facilitating the weight reduction of the box structure. In addition, in embodiments where the second plate is a fiber composite material plate, the second support can support the second plate, improving its flatness and reducing its deformation probability.

[0015] In some embodiments, a plurality of the battery cell groups are arranged along a second direction to form a battery cell array, the second direction intersecting the first direction; the support plate extends along the second direction to the opposite ends of the side beam along the second direction.

[0016] In this embodiment, the first support plate covers the entire length of the side beam along the second direction, thereby improving the deformation resistance of the side beam along the entire length of the second direction and reducing the possibility of local deformation and bending of the end wall.

[0017] In some embodiments, a plurality of battery cell groups are arranged along a second direction to form a battery cell array, the second direction intersecting the first direction; a plurality of support plates are spaced apart along the second direction.

[0018] In this embodiment, multiple support plates are spaced apart along the second direction. On the one hand, this helps to further reduce weight. On the other hand, it allows the side beams to have the possibility of local deformation in some positions, so as to adapt to the collapse and deformation requirements of the box assembly under thermal runaway and other accident conditions.

[0019] In some embodiments, projections are made along the first direction onto the same projection plane, and the splicing area of ​​the projections of two adjacent battery cell groups is covered by the projection of one of the support plates.

[0020] In this embodiment, the support plate covers the splicing area between two adjacent battery packs, which can further improve the stress distribution of the support plate and thus enhance the deformation resistance of the side beam.

[0021] In some embodiments, the first wall includes a laminated insulating structure layer and a fiber composite material layer, wherein the insulating structure layer is located between the fiber composite material layer and the battery cell along the thickness direction of the first wall, and the extension plate is located between the insulating structure layer and the fiber composite material layer of the first wall.

[0022] In this embodiment, the insulating structural layer serves both to support the battery cells and to electrically isolate them from the outside environment, reducing external interference. The combination of the insulating structural layer and the fiber composite material layer helps the housing assembly balance structural strength and protective performance. The extension plate, located between the insulating structural layer and the fiber composite material layer, enhances the positional stability of the extension plate and improves the connection and integrity between the first wall and the side beams, thus contributing to the structural strength of the housing assembly.

[0023] In some embodiments, the battery cell has a pressure relief mechanism, the battery cell is arranged such that the pressure relief port of the pressure relief mechanism faces the first wall, the first wall has a through hole at a position corresponding to the pressure relief mechanism, the extension plate has a clearance notch, and is projected onto the same projection plane along the thickness direction of the first wall, the projection of the pressure relief port of the pressure relief mechanism is located within the projection of the clearance notch and within the projection of the through hole.

[0024] In this embodiment, since the projections of the clearance notch and the through hole completely cover the projection of the pressure relief port, the pressure relief airflow ejected from the pressure relief port passes through the through hole and the first clearance notch through the first wall, making it less likely to impact the first wall or the structure on it, so as to protect the housing assembly and other battery cells in it and reduce the probability of heat diffusion.

[0025] In some embodiments, the housing assembly includes a first wall, the battery cell is supported on the first wall, and the reinforcing structure includes a first reinforcing rib extending along the thickness direction of the first wall.

[0026] In this embodiment, the reinforcing ribs, including a first reinforcing rib extending along a third direction, help to further improve the deformation resistance of the support plate.

[0027] In some embodiments, the support plate forms a top flange at one end away from the first wall, the top flange extending in a direction away from the battery cell along the first direction, and one end of the first reinforcing rib is connected to the top flange.

[0028] In this embodiment, the support plate forms a top flange at one end away from the first wall and in the direction away from the battery cell along a third direction. One end of the first reinforcing rib is connected to the top flange. In this way, the stress distribution of the support plate can be further improved, thereby enhancing the deformation resistance of the side beam.

[0029] In some embodiments, the first support further includes a connecting plate, which is connected to the side of the first support plate opposite to the battery cell along the first direction and extends along the first direction. The thickness direction of the connecting plate is the thickness direction of the first wall. The connecting plate is located on the side of the top flange close to the first wall, and the other end of the first reinforcing rib is connected to the connecting plate.

[0030] In this embodiment, the two ends of the first reinforcing rib along the third direction are respectively connected to the top flange and the connecting plate. The three work together to form an "I" shaped structure on the back of the support plate, thereby further improving the structural strength of the support plate and thus improving the deformation resistance of the side beam.

[0031] In some embodiments, the angle between the edge of the first reinforcing rib facing away from the support plate along the first direction and the surface of the connecting plate along the thickness direction is less than 90°.

[0032] In this embodiment, the angle between the edge of the first reinforcing rib away from the support plate along the first direction and the surface of the connecting plate along the thickness direction is an acute angle. This helps to transfer more of the force borne by the first reinforcing rib to the connecting plate, optimizes the stress distribution of the first support, and further improves the deformation resistance of the side beam.

[0033] In some embodiments, the housing assembly further includes a mounting plate located on the side of the side beam opposite to the battery cell, and spaced apart from and opposite to the side beam along the first direction, and the connecting plate is connected to the mounting plate.

[0034] In this embodiment, the mounting plate is connected to the connecting plate, which further enhances the structural strength of the mounting plate and improves its stability when connected to the external structure. Furthermore, a groove-shaped space is formed between the mounting plate and the side beam, which can be used to install control components for the battery device and / or external structures.

[0035] In some embodiments, a plurality of first reinforcing ribs are spaced apart on the support plate along a second direction, the second direction intersecting the first direction. Along the second direction, a battery cell has two battery shoulders and a battery center. The battery center is connected to the two battery shoulders and located between the two battery shoulders. The distance between two adjacent first reinforcing ribs located in the battery center is t1, and the distance between two adjacent first reinforcing ribs located in the battery shoulders is t2, where t1 < t2.

[0036] In this embodiment, the first reinforcing ribs are relatively densely distributed in the middle of the battery and relatively sparsely distributed in the shoulder area. This is because the thermal expansion is more pronounced in the middle of the battery compared to the shoulder area. This arrangement helps to reduce the surface pressure difference (e.g., controlling it to no more than 0.4 MPa) of the battery cell along the first direction when the battery cell expands, thereby minimizing stress concentration during battery cell expansion.

[0037] In some embodiments, the reinforcing structure includes a second reinforcing rib extending along a second direction that intersects with the first direction, and at least one end of the second reinforcing rib along the second direction is connected to the first reinforcing rib.

[0038] In this embodiment, a second reinforcing rib is further added. The extension direction of the second reinforcing rib intersects with that of the first reinforcing rib. The two work together to further improve the structural strength of the support plate, thereby improving the deformation resistance of the side beam.

[0039] In some embodiments, the side beam includes a second plate located on the side of the support structure opposite to the first plate along the first direction. The support structure also includes a second support body located between the support plate and the fiber composite material layer. A plurality of first reinforcing ribs are spaced apart on the support plate along a second direction, which intersects with the first direction. The second support body is disposed between two adjacent first reinforcing ribs along the second direction.

[0040] In this embodiment, a second support is provided in the gap between two adjacent first reinforcing ribs. In this way, the second support can not only support the second plate, but also provide support for the first reinforcing ribs, thereby further improving the structural strength of the support plate and thus improving the deformation resistance of the side beam.

[0041] In some embodiments, the two ends of the second support body along the second direction abut against the first reinforcing rib; and / or the two ends of the second support body along the first direction abut against the support plate and the second plate, respectively.

[0042] In this embodiment, the abutment between the two ends of the second support body along the second direction and the first reinforcing rib helps the second support body better support the first reinforcing rib, further improving the deformation resistance of the side beam. The abutment between the two ends of the second support body along the first direction and the support plate and the second plate respectively helps the second support body better support the second plate and the support plate.

[0043] In some embodiments, the first support includes a first fiber fabric and a first substrate, the first fiber fabric including a plurality of first fibers; the first fibers including at least one of carbon fiber and polyethylene fiber; and / or the first substrate including at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0044] In this embodiment, the first support is further configured to include a fiber composite material, which can further reduce the weight of the housing assembly and increase the energy density of the battery device. Furthermore, since the first support does not require insulation, the first fiber of the first support includes at least one of carbon fiber and polyethylene fiber. Compared with other optional fibers mentioned above, these two fibers have higher structural strength and lower weight, which helps to further reduce weight and improve the deformation resistance of the side beam.

[0045] In some embodiments, the first support further includes an extension plate connected to the support plate, the extension plate being connected to the side of the support plate facing the battery cell and extending along the first direction, and at least a portion of the first fiber fabric extending from the support plate to the extension plate.

[0046] In this embodiment, by extending at least a portion of the first fiber fabric from the support plate to the extension plate, the support plate and the extension plate can be formed into an integral structure, thereby improving the connection strength between them. This further enhances the support capacity of the extension plate and the deformation resistance of the side beam.

[0047] In some embodiments, the first support further includes a reinforcing structure disposed on the side of the support plate opposite to the battery cell along the first direction, and at least a portion of the first fiber fabric extends from the support plate to the reinforcing structure.

[0048] In this embodiment, by extending at least a portion of the first fiber fabric from the support plate to the reinforcing structure, the support plate and the reinforcing structure can be integrated into a single structure. This enhances the reinforcing effect of the reinforcing structure on the structural strength of the support plate, thereby improving the structural strength of the support plate and ultimately enhancing the deformation resistance of the side beam.

[0049] In some embodiments, the battery device further includes: a fiber composite sheet, the fiber composite sheet including a main body and a connecting portion, the connecting portion being located at both ends of the main body along a first direction, and the connecting portion being connected to the side beam.

[0050] In this embodiment, the battery device is provided with a fiber composite tension plate. While reducing weight, the fiber composite tension plate effectively limits the expansion of the battery cell assembly through the main body and the connecting part. The connecting part of the fiber composite tension plate is connected to the side beam so that part of the expansion force borne by the side beam can be transferred to the fiber composite tension plate. In other words, the fiber composite tension plate can share the expansion force of the battery cell with the side beam, thereby improving the modulus and strength of the housing assembly, especially improving the modulus of the housing assembly along the first direction, and reducing the probability of bending deformation of the side beam and / or reducing the amount of deformation when the side beam bends.

[0051] In some embodiments, the housing assembly includes a first wall on which the battery cells are supported, and the side beams are connected to opposite ends of the first wall along the first direction; the fiber composite pull plate includes at least one first pull plate that covers at least a portion of the terminal posts of the battery cell group from the side of the battery cell group away from the first wall.

[0052] In this embodiment, the first pull plate covers the terminal side of the battery cell assembly from the side of the battery cell assembly away from the first wall, and can provide a limit for the battery cell assembly in the thickness direction (i.e., the third direction) of the first wall so as to fix the battery cell assembly to the housing assembly. The first pull plate can also resist the expansion force of the battery cell along the thickness direction (i.e., the third direction) of the first wall.

[0053] In some embodiments, the fiber composite sheet includes at least one second sheet covering at least a portion of the battery cell assembly along a second direction intersecting the first direction.

[0054] In this embodiment, the second pull plate can cover at least a portion of the battery cell group along the second direction, thereby bearing the expansion force of the battery cell along the second direction, thereby further improving the modulus and strength of the housing assembly. Furthermore, the second pull plate is connected to the side beam, which can further improve the deformation constraint force on the side beam, thereby further improving the structural strength of the housing assembly.

[0055] In some embodiments, the side beam includes a laminated insulating structural layer and a fiber composite material layer, with at least a portion of the insulating structural layer located between the fiber composite material layer and the battery cell, and at least a portion of the first plate being formed by the insulating structural layer.

[0056] In this embodiment, the side beam includes a laminated insulating structure layer and a fiber composite material layer. At least a portion of the first plate is formed by the insulating structure layer, thus achieving weight reduction while further meeting the insulation requirements of the side beam.

[0057] In some embodiments, a hollow cavity is formed between the insulating structure layer and the fiber composite material layer, and the support structure is located in the hollow cavity and abuts against the insulating structure layer.

[0058] In this embodiment, the hollow cavity in the side beam effectively reduces its weight, facilitating the lightweighting of the housing assembly. Furthermore, the hollow cavity also serves as a heat insulation layer, improving the thermal management performance of the battery device. Additionally, a support structure is installed within the hollow cavity to support the insulation layer and fiber composite material layer, enhancing their resistance to deformation. The support structure also disperses impacts, improving the structural stability of the housing assembly.

[0059] In some embodiments, a portion of the insulating structural layer of the side beam is configured as a flange, which is connected to the composite material layer to form a connecting layer.

[0060] In this embodiment, the insulation layer and the fiber composite material layer of the side beam are connected by a connecting layer. The connecting structure includes a flange formed by the insulation layer, which helps to form a stable connecting layer, improves the connection strength between the insulation layer and the fiber composite material layer, and thus improves the structural stability of the box assembly.

[0061] In some embodiments, the housing assembly includes a first wall, the battery cell is supported on the first wall, and the side beam is connected to opposite ends of the first wall along the first direction; the connecting layer is located at the end of the side beam on the side opposite to the first wall along the thickness direction of the first wall, or the connecting layer is located on the side of the side beam on the side opposite to the battery cell along the first direction.

[0062] In this embodiment, the connecting layer is disposed on the top or outside of the side beam, so that the insulating structure layer extends to the outside of the housing assembly before being connected, so that the side beam facing the battery cell is fully covered by the insulating structure layer, which can reduce the impact of the connecting layer on the internal structure or battery cell, and also makes assembly easier.

[0063] In some embodiments, in the connecting layer, the flanged portion overlaps with the fiber composite material layer, or the flanged portion is mated with the fiber composite material layer.

[0064] In this embodiment, the bent flange and the fiber composite material layer are overlapped, which has good sealing and connection performance, reduces the number of components, and facilitates assembly; the flange and the fiber composite material layer adopt a butt joint structure, which has good flatness and makes the structure of a single component simpler.

[0065] In some embodiments, the housing assembly further includes an overlap layer in which the flanged portion abuts against the fiber composite material layer, and the overlap layer at least covers the seam between the flanged portion and the fiber composite material layer.

[0066] In this embodiment, by setting an overlap layer, the overlap layer can cover the joint between the flange and the fiber composite material layer, which can improve the sealing effect and also help to improve the connection strength between the insulation structure layer and the fiber composite material layer.

[0067] In some embodiments, the insulating structural layer includes a second fiber fabric, the fiber composite material layer includes a third fiber fabric, the second fiber fabric includes a plurality of second fibers, the third fiber fabric includes a plurality of third fibers, and the second fibers are different from the third fibers.

[0068] In this embodiment, the insulation structure includes a second fiber fabric woven from multiple second fibers, and the fiber composite material layer includes a third fiber fabric woven from multiple third fibers. The fiber fabric has high structural strength and load-bearing capacity, which helps to improve the load-bearing and protective capabilities of the enclosure assembly.

[0069] In some embodiments, the second fiber comprises at least one of glass fiber, basalt fiber, and aramid fiber; and / or, the third fiber comprises at least one of carbon fiber and polyethylene fiber.

[0070] In this embodiment, the second and third fibers can be made of suitable materials as needed to be applied to a variety of different scenarios, thereby improving the adaptability of the battery device.

[0071] In some embodiments, the number of layers of the first fiber fabric in the insulating structure layer is less than or equal to the number of layers of the second fiber fabric in the composite material layer.

[0072] In this embodiment, the insulation structure layer has fewer layers of second fiber fabric, which helps to reduce material consumption and reduce the wall thickness of the housing assembly; the fiber composite material layer has more layers of third fiber fabric, which helps to improve structural strength.

[0073] In some embodiments, the housing assembly includes two side plates disposed opposite each other along a second direction, the side plates constraining the battery cell assembly, the second direction intersecting the first direction, the side beams being connected to the two side plates at opposite ends along the second direction, the side plates including a laminated insulating structural layer and a fiber composite material layer, the insulating structural layer being located between the fiber composite material layer and the battery cell along the second direction.

[0074] In this embodiment, two side plate components are provided, which are disposed on both sides of the first wall along the second direction. These side plates can restrict the expansion force or deformation of the battery cells along the second direction. Furthermore, the side plates include an insulating structural layer and a fiber composite material layer, which helps to further reduce the weight of the housing assembly and increase the energy density of the battery device. The insulating structural layer further helps to electrically isolate the battery cells from the outside environment.

[0075] In some embodiments, the side plate is configured as a hollow structure with a hollow cavity located between the insulating structural layer and the fiber composite material layer of the side plate.

[0076] In this embodiment, the hollow cavity in the side plate can effectively reduce the weight of the side beam, which is beneficial to the lightweighting of the housing assembly. In addition, the hollow cavity can also serve as a heat insulation layer to improve the thermal management performance of the battery device.

[0077] In some embodiments, the side plate further includes a third support located within the hollow cavity of the side plate and abutting against at least one of the insulating structural layer and the fiber composite material layer.

[0078] In this embodiment, a third support is provided in the hollow cavity of the side plate. The third support provides support for the insulation structure layer and fiber composite material layer of the side plate, which can improve the deformation resistance of the insulation structure layer and fiber composite material layer. The third support can also disperse impact and improve the structural stability of the box assembly.

[0079] A second aspect of the present disclosure provides an electrical device that includes a battery device according to a first aspect of the present disclosure.

[0080] The electrical device of this disclosure has all the beneficial effects of the battery device described in any of the above embodiments, and will not be repeated here.

[0081] In some embodiments, the electrical equipment includes an aircraft. Attached Figure Description

[0082] Figure 1 The diagram shows the structure of an electrical device (aircraft) provided in some embodiments of this application.

[0083] Figure 2 Explosion-proof diagrams of battery devices provided in some embodiments of this application;

[0084] Figure 3 This is a schematic diagram of the structure of a housing assembly according to one embodiment of this application;

[0085] Figure 4 for Figure 3 A schematic diagram of the AA cross-section;

[0086] Figure 5 for Figure 4 Enlarged schematic diagram of part B;

[0087] Figure 6 This is an exploded view of a battery device according to an embodiment of this application;

[0088] Figure 7 This is a schematic diagram of the structure of the first support body according to an embodiment of this application;

[0089] Figure 8 This is a schematic diagram of the structure of the first support body according to another embodiment of this application;

[0090] Figure 9 for Figure 8 A schematic diagram showing the positional relationship between the first support and the battery cell assembly, where the first plate is hidden;

[0091] Figure 10 for Figure 7 A structural diagram of section C;

[0092] Figure 11 for Figure 7 A schematic diagram showing the relationship between the first support structure and the battery cell assembly.

[0093] Figure 12 for Figure 11 An enlarged schematic diagram of section D in the middle;

[0094] Figure 13 This is an exploded schematic diagram of a battery device according to another embodiment of this application;

[0095] Figure 14 A schematic diagram of the structure of the second support body according to an embodiment of this application;

[0096] Figure 15 This is an exploded view of the housing according to another embodiment of this application;

[0097] Figure 16 This is a schematic diagram illustrating the mating relationship between the first reinforcing rib and the reinforcing sheet in an embodiment of this application;

[0098] Figure 17 This is a schematic diagram illustrating the cooperation relationship between the first support body, the first plate, and the second plate according to another embodiment of this application;

[0099] Figure 18 This is a schematic diagram showing the cooperation relationship between the first support body, the first plate, and the second plate in another embodiment of this application;

[0100] Figure 19 This is an exploded view of a battery device according to another embodiment of this application.

[0101] Explanation of reference numerals in the attached figures

[0102] 1000, Aircraft; 100, Battery Unit; 1, Battery Cell Array; 10, Battery Cell Pack; 11, Battery Cell; 111, Pressure Relief Mechanism; 112, Terminal Post; 2, Housing Assembly; 2a, Insulation Structure Layer; 2a', Flanged Edge; 2b, Fiber Composite Material Layer; 2c, Connecting Layer; 21, Side Beam; 21a, Hollow Cavity; 211, First Plate; 212, Support Structure; 213, First Support Body; 2131, Support Plate; 2131a, Top Flanged Edge; 2132, Extension Plate; 2132a, Clearance Notch; 2133, Reinforcing Structure Structure; 2133a, First reinforcing rib; 2133b, Second reinforcing rib; 2134, Connecting plate; 2135, Reinforcing sheet; 2135a, First section; 2135b, Second section; 2136, Abutting plate; 214, Second plate; 215, Second support body; 215a, Opening; 216, Third plate; 22, First wall; 22a, Through hole; 23, Side plate; 231, Third support body; 24, Hanging plate; 3, Fiber composite pull plate; 3a, Main body; 3b, Connecting part; 31, First pull plate; 32, Second pull plate; 200, Body. Detailed Implementation

[0103] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0104] The specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction. For example, different combinations of specific technical features can form different embodiments and technical solutions. To avoid unnecessary repetition, the various possible combinations of the specific technical features in this application will not be described separately.

[0105] In the following description, the terms "first," "second," etc., are used merely to distinguish different objects and do not indicate that the objects have the sameness or relationship. It should be understood that the directional descriptions "above," "below," "outside," and "inside" refer to the orientation under normal use conditions, while "left" and "right" refer to the left and right directions shown in the corresponding diagrams, which may or may not be the left and right directions under normal use conditions.

[0106] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. "A plurality of" means two or more.

[0107] In the description of this application, the orientation or positional relationship of "first direction", "second direction" and "third direction" are based on the orientation or positional relationship shown in the accompanying drawings. Among them, "first direction" is the direction indicated by arrow L1 in the accompanying drawings, "second direction" is the direction indicated by arrow L2 in the accompanying drawings, and "third direction" is the direction indicated by arrow L3 in the accompanying drawings. It should be understood that these orientation terms are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0108] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0109] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0110] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0111] With the development of clean energy, more and more devices are using electricity as their driving force, leading to the rapid development of power batteries, such as lithium-ion batteries, which can store a large amount of electrical energy and can be repeatedly charged and discharged. These power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0112] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0113] In some embodiments, a battery cell assembly is typically formed by an array of multiple battery cells.

[0114] As an example, a battery cell assembly can be a battery module, which consists of multiple battery cells arranged and fixed together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0115] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0116] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0117] As an example, battery cell assemblies can also be housed within a housing by directly fixing multiple battery cells to the housing. As an example, the housing may include a first housing and a second housing. The first and second housings are fastened together to form a closed space inside the housing for accommodating the battery cell assemblies. Here, "closed" refers to covering or shutting off; it can be sealed or not sealed. The first housing may be a top cover or a bottom plate.

[0118] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0119] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle / aircraft's floor, or a portion of the housing may be at least a part of the vehicle / aircraft's crossbeams and longitudinal beams.

[0120] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0121] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0122] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0123] In some embodiments, a battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0124] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0125] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also be provided with one or more.

[0126] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0127] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and aircraft.

[0128] Aircraft generally refer to machines that fly within or outside the atmosphere (space), and can include aircraft flying within the atmosphere and spacecraft flying in space. Aircraft can include airplanes, airships, etc., and for example, low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional aircraft, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0129] In related technologies, the enclosure is made of metal, which has problems such as large weight, poor insulation and protection performance, complex structure, and the need to weld multiple structures together, which may not meet the lightweight requirements of some electrical equipment.

[0130] In view of this, embodiments of this application provide a battery device, the battery device including a battery cell group and a housing assembly, the battery cell group including a plurality of battery cells stacked along a first direction, the housing assembly defining a receiving cavity, the battery cell group being disposed in the receiving cavity, wherein the housing assembly includes two side beams arranged opposite to each other along the first direction, the side beams including a first plate and a support structure, the first plate constraining the battery cell group, the support structure abutting against the first plate from the side away from the battery cells along the first direction, the first plate being a fiber composite material plate.

[0131] In this embodiment, the side beam of the housing assembly includes a first plate and a support structure. The first plate is used to constrain the battery cell pack, and the first plate is a fiber composite material plate. Compared with a metal structure, this reduces the weight of the housing assembly, thereby increasing the energy density of the battery device. Furthermore, the support structure abuts against the first plate from the side opposite to the battery cell along a first direction. In this way, the support structure and the first plate can jointly provide support force, thereby ensuring that the deformation resistance of the side beam meets the requirements while reducing weight.

[0132] The technical solutions described in the embodiments of this application are applicable to electrical devices that use battery devices. The electrical devices include the battery devices of any embodiment of this application, and the battery devices are used to provide electrical energy.

[0133] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, aircraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Aircraft generally refer to devices that fly within or outside the atmosphere (space), including aircraft flying within the atmosphere and spacecraft flying in space. Aircraft can include airplanes, airships, etc., for example, low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional aircraft, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This disclosure does not impose any special limitations on the aforementioned electrical equipment.

[0134] It should be noted that the technical solutions described in the embodiments of this application are not limited to the battery devices described above, but can also be applied to all electrical devices and energy storage devices that include battery devices. However, for the sake of brevity, the following embodiments are all described using aircraft as an example.

[0135] Reference Figure 1 The aircraft 1000 typically includes a battery unit 100 and an airframe 200, with the battery unit 100 located in the airframe 200 and providing electrical power to the airframe 200.

[0136] Reference Figure 2 To meet different power demands, the battery device 100 includes a battery cell group 10, which may include multiple battery cells 11. A battery cell 11 is the smallest unit that makes up a battery module or battery device 100. Multiple battery cells 11 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 11 are connected in both series and parallel connections. Multiple battery cells 11 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 11 is housed within a housing. Alternatively, the battery device 100 can also consist of multiple battery cells 11 first connected in series, parallel, or in a mixed configuration to form modules, and then multiple modules connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within a housing assembly.

[0137] Reference Figures 3-18This application provides a battery device 100, which includes a battery cell assembly 10 and a housing assembly 2. The battery cell assembly 10 includes a plurality of battery cells 11 stacked along a first direction. The housing assembly 2 defines a receiving cavity in which the battery cell assembly 10 is disposed. The housing assembly 2 includes two side beams 21 arranged opposite to each other along the first direction. Each side beam 21 includes a first plate 211 and a support structure 212. The first plate 211 constrains the battery cell assembly 10. The support structure 212 abuts against the first plate 211 from the side away from the battery cells 11 along the first direction. The first plate 211 is a fiber composite material plate.

[0138] The box assembly 2 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres.

[0139] The housing assembly 2 defines a receiving cavity in which the battery cell pack 10 is disposed. The battery cell pack 10 is then mounted to the electrical equipment via the housing assembly 2. As an example, the housing assembly 2 is typically a cuboid structure. Both the length and width directions of the housing assembly 2 are parallel to the horizontal plane, and the length direction of the housing assembly 2 is parallel to the longest side of its cuboid structure. The height direction of the housing assembly 2 is perpendicular to the ground.

[0140] The battery cell group 10 includes a plurality of battery cells 11 stacked along a first direction. The battery device 100 may include only one battery cell group 10 or multiple battery cell groups 10. The multiple battery cell groups 10 are distributed along a second direction to form a battery cell array 1.

[0141] Here, the first direction and the second direction intersect. Taking the box assembly 2 as a cuboid as an example, one of the first direction and the second direction can be the length direction of the box assembly 2, and the other can be the width direction of the box assembly 2.

[0142] As an example, the large surface of the battery cell 11 is perpendicular to the first direction, and the large surfaces of adjacent battery cells 11 in the battery pack are directly or indirectly connected along the first direction. Specifically, the large surface here refers to the surface with the largest area among all the surfaces of the battery cell 11.

[0143] The housing assembly 2 includes two side beams 21 arranged opposite each other along a first direction. The side beams 21 are specifically used to constrain the battery cell group 10 and bear the expansion force from the battery cells 11. The side beams 21 may directly or indirectly abut against the battery cells 11, or a gap may be formed between the side beams 21 and the battery cells 11, which is not limited.

[0144] As an example, in addition to the side beams 21, the housing assembly 2 may also include a first wall 22, with the two side beams 21 respectively connected to opposite ends of the first wall 22 along a first direction.

[0145] The first wall 22 is used to support the battery cell 11. Specifically, "supporting" here means bearing the weight of the battery cell 11; that is, the first wall 22 is located on the bottom side of the battery cell 11 along the direction of gravity. The thickness direction of the first wall 22 is the third direction. Taking the housing assembly 2 as an example of a cuboid structure, the third direction is the height direction of the housing assembly 2, which is also the height direction of the battery cell 11. In some embodiments, the first direction, the second direction, and the third direction are perpendicular to each other.

[0146] Furthermore, the housing assembly 2 may also include two side plates 23 disposed opposite to each other along the second direction. The two side plates 23 are respectively connected to the opposite ends of the first wall 22 along the second direction, and the opposite ends of the side beam 21 along the second direction are respectively connected to the two side plates 23. The side plates 23 are specifically used to constrain the battery cells 11 along the second direction.

[0147] The side beam 21 specifically includes a first plate 211 and a support structure 212. The first plate 211 is used to constrain the battery cell pack 10. The first plate 211 is a fiber composite material plate.

[0148] The first plate 211 here refers to a fiber composite material plate, specifically meaning that at least a portion of the structure of the first plate 211 is made of fiber composite material. As an example, the fiber composite material mentioned here and in related sections below includes a matrix phase and a reinforcing phase. The reinforcing phase includes fibers, and the matrix phase bonds the reinforcing phase together, forming a whole, thus giving the fiber composite material continuity and integrity. The reinforcing phase is used to improve the strength and stiffness of the composite material, enhancing its mechanical properties.

[0149] As an example, the matrix phase includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. The reinforcing phase includes fibers, which can be formed into unidirectional fiber strips and / or fiber fabrics, and the fibers are selected from at least one of glass fibers, basalt fibers, aramid fibers, ceramic fibers, carbon fibers, and polyethylene fibers.

[0150] Of course, those skilled in the art will understand that the selection of the matrix phase and reinforcing phase of fiber composites is not limited to this, and any suitable material can be selected as the matrix phase and reinforcing phase here according to actual application requirements.

[0151] It should be noted that since the first plate 211 may be in direct or indirect contact with the battery cell pack 10, the first plate 211 may need to meet insulation requirements. In the case where the fibers in the fiber composite material of the first plate 211 are selected from carbon fiber or other conductive fibers, an insulating layer may be provided on the surface of the first plate 211 facing the battery cell pack 10.

[0152] Compared with the pure metal structure of the box assembly 2 in related technologies, setting the first plate 211 of the side beam 21 as a fiber composite material plate can reduce the overall weight of the box assembly 2, thereby increasing the energy density of the battery device 100 and meeting the lightweight requirements of electrical equipment.

[0153] Furthermore, the support structure 212 abuts against the first plate 211 from the side opposite to the battery cell 11 along the first direction. It is understood that the side beam 21 needs to withstand the expansion force from the battery cell 11. Therefore, in this embodiment, the support structure 212 is provided. The support structure 212 can provide support for the first plate 211, further improving the structural strength of the first plate 211. Thus, in the case where the first plate 211 is a fiber composite material plate, the deformation resistance of the side beam 21 is improved, meeting the expansion resistance requirements of the side beam 21.

[0154] As an example, the side beam 21 may include other plate-like structures besides the first plate 211, with each plate-like structure forming a hollow cavity 21a. The supporting structure 212 is disposed within the hollow cavity 21a. The other plate-like structures besides the first plate 211 may be fiber composite panels, metal plates, or plate structures made of other materials; there are no restrictions on this. Of course, the side beam 21 may also consist only of the first plate 211 and the supporting structure 212.

[0155] In this embodiment, the specific material of the support structure 212 is not limited, and may include at least one of the following: metal, fiber composite material, foam, etc. The specific structural form of the support structure 212 is also not limited, as long as it can meet the expansion resistance requirements of the side beam 21 when used in conjunction with the first plate 211.

[0156] The specific structural form of the supporting structure 212 is not limited, and it can be a combination of one or more structures such as column structure, rib structure, shell structure, plate structure, mesh structure, honeycomb structure, and filling structure.

[0157] The support structure 212 and the first plate 211 can be relatively fixed by means such as bonding or welding, or they can simply abut against each other without being relatively fixed.

[0158] In this embodiment, the side beam 21 of the housing assembly 2 includes a first plate 211 and a support structure 212. The first plate 211 is used to constrain the battery cell group 10, and the first plate 211 is a fiber composite material plate. Compared with a metal structure, it can reduce the weight of the housing assembly 2, thereby increasing the energy density of the battery device 100. Furthermore, the support structure 212 abuts against the first plate 211 from the side opposite to the battery cell 11 along the first direction. In this way, the support structure 212 and the first plate 211 can jointly provide support force, thereby reducing weight while ensuring that the deformation resistance of the side beam 21 meets the requirements.

[0159] In some embodiments, refer to Figure 5 , Figures 7-8 , Figures 17-18 The support structure 212 includes a first support body 213, which has a support plate 2131 facing the first plate 211. The first direction is the thickness direction of the support plate 2131, and the support plate 2131 abuts against the first plate 211 along the first direction.

[0160] In this embodiment, the number of support plates 2131 can be one or more.

[0161] When there is only one support plate 2131, refer to Figure 7 The support plate 2131 can extend along the second direction to the opposite ends of the side beam 21 and / or the support plate 2131 can extend along the thickness direction of the first wall 22 (i.e., the third direction) to the opposite ends of the side beam 21.

[0162] When there are multiple support plates 2131, refer to Figure 8 At least a portion of the support plate 2131 may be distributed along the second direction, and / or, refer to Figure 17 At least a portion of the support plate 2131 can be distributed along the thickness direction (i.e., the third direction) of the first wall 22, without any restriction.

[0163] When there are multiple support plates 2131, the first support 213 may include a connecting structure that connects at least a portion of the support plates 2131 to each other. As an example, see [reference needed]. Figure 8 The first support 213 includes a plurality of support plates 2131 spaced apart along a second direction, and adjacent support plates 2131 along the second direction are connected by a connecting structure. As another example, see [reference needed]. Figure 17 The first support 213 includes a plurality of support plates 2131 distributed along the thickness direction (i.e., the third direction) of the first wall 22, and two adjacent support plates 2131 along the third direction are connected by a connecting structure.

[0164] Of course, if there are multiple support plates 2131, the first support body 213 may not include the connecting structure.

[0165] In this embodiment, the first support 213 is configured to include a support plate 2131. This can improve the contact area and the uniformity of force between the first support 213 and the first plate 211, thereby helping to further improve the deformation resistance of the side beam 21 and meet the requirements for resistance to expansion force.

[0166] In some embodiments, refer to Figure 5 and Figure 6 As mentioned above, the housing assembly 2 includes a first wall 22, two side beams 21 connected to opposite ends of the first wall 22 along a first direction, and battery cells 11 supported on the first wall 22. In this embodiment, the first support body 213 also includes an extension plate 2132 connected to the support plate 2131. The extension plate 2132 is connected to the side of the support plate 2131 facing the battery cells 11 and extends along the first direction. The extension plate 2132 is connected to the first wall 22 and projects onto the same projection plane along the thickness direction (i.e., the third direction) of the first wall 22. The projection of the extension plate 2132 overlaps with the projection of at least a portion of the battery cells 11.

[0167] Here, the specific structural form of the first wall 22 is not limited. The relative positional relationship between the extension plate 2132 and the first wall 22 is not limited. For example, the extension plate 2132 may be located on the side of the first wall 22 facing the battery cell 11 or away from the battery cell 11 along the thickness direction (i.e., the third direction). Alternatively, the first wall 22 may be formed as a cavity structure, and at least a portion of the extension plate 2132 may be located within the cavity of the first wall 22.

[0168] The connection method between the extension plate 2132 and the first wall 22 is not limited. For example, they can be connected by means of bonding, welding, snap-fitting, fastener connection, etc. Alternatively, the extension plate 2132 and the first wall 22 can form an integral structure, or the extension plate 2132 and the first wall 22 can only abut against each other without being fixedly connected.

[0169] The extension plate 2132 is connected to the support plate 2131. The two can form an integral structure, or they can be connected by means of bonding, welding, snap-fitting, fastener connection, etc. In some examples, the extension plate 2132 and the support plate 2131 form an integral structure and extend in different directions.

[0170] The extension plate 2132 can extend specifically along a first direction, and the specific length range of the extension plate 2132 extending along the first direction is not limited. As an example, when projected onto the same projection plane along the thickness direction (i.e., the third direction) of the first wall 22, the projection of the extension plate 2132 overlaps with the projection of 3-5 battery cells 11. As another example, the extension plates 2132 at corresponding positions of the first supports 213 of the two side beams 21 are connected to each other.

[0171] In this embodiment, the extension plate 2132 can, on the one hand, jointly support the battery cell 11 with the first wall 22, thereby enhancing the support capacity of the housing assembly 2. On the other hand, the extension plate 2132 helps to balance the force on the support plate 2131, reduce the probability of the support plate 2131 tilting and deforming, and thus improve the deformation resistance of the side beam 21, meeting the expansion resistance requirements of the side beam 21.

[0172] In some embodiments, refer to Figures 6-12 The first support 213 also includes a reinforcing structure 2133 disposed on the side of the support plate 2131 away from the battery cell 11 along the first direction.

[0173] Here, the specific structural form of the reinforcing structure 2133 is not limited. As an example, the reinforcing structure 2133 includes one or more reinforcing ribs.

[0174] The reinforcement structure 2133 is connected to the support plate 2131. The two can form an integral structure, or they can be connected by means of bonding, welding, snap-fitting, fastener connection, etc.

[0175] In this embodiment, by providing a reinforcing structure 2133 on the side of the support plate 2131 away from the battery cell 11 along the first direction, the structural strength of the support plate 2131 can be further improved, thereby enhancing the deformation resistance of the side beam 21.

[0176] In some embodiments, refer to Figure 5 , Figures 13-15 The side beam 21 includes a second plate 214, which is located on the side of the support plate 2131 opposite to the first plate 211 along a first direction. The support structure 212 also includes a second support body 215, which is located between the support plate 2131 and the second plate 214, and the second support body 215 includes a foam layer; or, the second support body 215 is configured as a fiber composite shell with an opening 215a at at least one end, the opening 215a facing the support plate 2131.

[0177] Here, the second plate 214 can be a fiber composite board, a metal plate, or any other suitable material. In the case that the second plate 214 is a fiber composite board, the fibers in the second plate 214 and the first plate 211 can be the same or different.

[0178] The second board 214 can be connected to the first board 211 or not; there is no restriction on this.

[0179] The support structure 212 also includes a second support body 215, which is located between the support plate 2131 and the second plate 214. Here, the specific structural form of the second support body 215 is not limited. As an example, the second support body 215 is configured to fill at least a portion of the gap between the support plate 2131 and the second plate 214.

[0180] As an example, refer to Figure 15 The second support 215 may include a foam layer, which may be one or more of polyurethane foam, polystyrene foam, polypropylene foam or metal foam.

[0181] As another example, see Figure 13 and Figure 14 The second support 215 is configured as a fiber composite shell, which can be made of fiber-reinforced composite material. The fiber composite shell can include one or more chambers, and the openings 215a of each chamber face the support plate 2131 so that the second support 215 and the first support 213 cooperate to form a structure that closes the chambers.

[0182] In this embodiment, the multiple chambers of the fiber composite shell can adopt the same or different structures, and the multiple chambers can be distributed along a rectangular or circular array.

[0183] In this embodiment, the fiber composite shell includes a fiber composite material, and the fibers in the fiber composite material may be the same as or different from the fibers in the fiber composite material of the first plate 211.

[0184] In this embodiment, the second support 215, in conjunction with the first support 213, can further enhance the structural strength and deformation resistance of the side beam 21.

[0185] Furthermore, the second support 215 formed by the foam layer can further mitigate impact, providing excellent support and being lightweight, thus facilitating the weight reduction of the box structure. The second support 215 formed by the fiber composite shell possesses good structural strength and can also provide thermal insulation and corrosion resistance depending on the matrix phase. The cavity of the opening 215a can reduce weight, further facilitating the weight reduction of the box structure. In addition, in embodiments where the second plate 214 is a fiber composite material plate, the second support 215 can support the second plate 214, improving its flatness and reducing its probability of deformation.

[0186] In some embodiments, alternatively, refer to Figure 16The first support body 213 includes a reinforcing plate 2135, which includes a first segment 2135a and a second segment 2135b arranged at an angle. The first segment 2135a is connected to the first reinforcing rib 2133a, and the second segment 2135b is arranged opposite to the support plate 2131 along the first direction and abuts against the second plate 214.

[0187] As an example, the first segment 2135a and the second segment 2135b of the reinforcing sheet 2135 are set approximately perpendicularly. The specific material of the reinforcing sheet is not limited.

[0188] In this embodiment, the second plate 214 is supported by a reinforcing sheet 2135, which helps to reduce costs compared to using a second support body 215 to support the second plate 214.

[0189] In some embodiments, as a supplement or alternative, refer to Figure 17 and Figure 18 The first support body 213 includes an abutment plate 2136, which is disposed between the second plate 214 and the support plate 2131 and abuts against the second plate 214, thereby supporting the second plate 214.

[0190] In this embodiment, the abutment plate 2136 and the support plate 2131 can be connected to each other, for example, referring to... Figure 17 The first support 213 may include at least one support plate 2131 and at least one abutment plate 2136, projected onto the same projection plane along a first direction. The projections of the support plate 2131 and the abutment plate 2136 are offset from each other along a third direction. Along the third direction, adjacent support plates 2131 and abutment plates 2136 are connected by a connecting structure. That is, the first support 213 is formed as a corrugated plate structure.

[0191] Or, refer to Figure 18 The first support 213 may include at least one support plate 2131 and at least one abutment plate 2136, which are projected onto the same projection plane along a first direction. The projections of the support plate 2131 and the abutment plate 2136 at least partially overlap, and a connection structure is provided between the support plate 2131 and the abutment plate 2136.

[0192] In the above embodiment, a cavity is formed between the abutment plate 2136 and the support plate 2131. The cavity may be filled with the second support 215 mentioned above, or it may not be filled.

[0193] In some embodiments, refer to Figure 6 and Figure 7 Multiple battery cell groups 10 are arranged along the second direction to form a battery cell array 1. The second direction intersects with the first direction. The support plate 2131 extends along the second direction to the opposite ends of the side beam 21 along the second direction.

[0194] In this embodiment, the first support plate 2131 covers the entire length of the side beam 21 along the second direction. This improves the deformation resistance of the side beam 21 along the entire length of the second direction and reduces the possibility of local deformation and bending of the end wall.

[0195] In some embodiments, refer to Figure 8 and Figure 9 Multiple battery cell groups 10 are arranged along the second direction to form a battery cell array 1. The second direction intersects with the first direction. Multiple support plates 2131 are spaced apart along the second direction.

[0196] Here, the specific number of support plates 2131 is not limited. Along the second direction, the support plates 2131 can be evenly distributed or unequally distributed.

[0197] The spacing between two adjacent first support plates 2131 along the second direction, and the relative positional relationship between the spacing and other structures of the battery device 100 (e.g., battery cells 11), can be specifically determined by those skilled in the art based on actual usage requirements.

[0198] In this embodiment, multiple support plates 2131 are spaced apart along the second direction. On the one hand, this helps to further reduce weight. On the other hand, it allows the side beams 21 to have the possibility of local deformation in some positions, so as to adapt to the collapse and deformation requirements of the box assembly 2 under thermal runaway and other accident conditions.

[0199] In some embodiments, refer to Figure 8 The first support 213 also includes a connecting structure that connects multiple support plates 2131.

[0200] In this embodiment, the specific structural form of the connecting structure is not limited, as long as it can connect multiple support plates 2131. The specific connection method between the connecting structure and the support plate 2131 is not limited, such as riveting, snap-fitting, threaded connection, or the connecting structure can be integrated with the support plate 2131.

[0201] As an example, the connection structure includes at least one connecting rib, which forms an integral structure with the support plate 2131.

[0202] In this embodiment, only one connecting rib can be provided between two adjacent first support plates 2131, or multiple connecting ribs distributed along a third direction can be provided.

[0203] In this embodiment, a connecting structure is used to connect multiple support plates 2131. This creates a weak area on the side beam 21 while still meeting the structural strength requirements of the side beam 21 under normal operating conditions. In some other embodiments, a connecting structure may not be provided between adjacent support plates 2131.

[0204] In the embodiment where the first support 213 includes a plurality of support plates 2131 spaced apart along the second direction, when projected onto the same projection plane along the first direction, the splicing area of ​​the projections of two adjacent battery cell groups 10 is covered by the projection of one support plate 2131.

[0205] The splicing area here specifically refers to the gap between the projected areas of two adjacent battery packs and a portion of the area surrounding that gap. In other words, in this embodiment, the projection of a support plate 2131 simultaneously covers a portion of each of the two adjacent battery packs and the gap between them.

[0206] In this embodiment, the support plate 2131 covers the splicing area between two adjacent battery packs, which can further improve the stress distribution of the support plate 2131 and thus enhance the deformation resistance of the side beam 21.

[0207] In some embodiments, refer to Figure 9 Each battery cell 11 has a pressure relief mechanism 111. In the projection plane perpendicular to the first direction, the projection of the pressure relief mechanism 111 is located in the interval area between the projections of two adjacent support plates 2131.

[0208] Here, the interval between the projections of two adjacent support plates 2131 refers to a strip area that extends upward in a third direction with the two adjacent support plates 2131 as the boundary in the first direction. In other words, the range of this interval area is not limited to the range of the support plates 2131 extending in the third direction.

[0209] In this embodiment, the pressure relief mechanism 111 is used to release internal gas when the internal pressure of the battery cell 11 rises abnormally (such as in the case of overcharging, overheating or short circuit), so as to prevent the battery from exploding or catching fire.

[0210] In some examples, the pressure relief mechanism 111 includes a safety valve. If the gas pressure inside the battery cell 11 exceeds the pressure threshold of the safety valve, it can be released through the safety valve. That is, the gas inside the battery cell 11 flows out through the pressure relief port, thereby reducing the pressure inside the battery cell 11.

[0211] In this embodiment, the pressure relief mechanism 111 can be located on the side of the battery cell 11 facing the first wall 22 in a third direction, or it can be located on the side of the battery cell 11 away from the first wall 22 in a third direction, and there is no limitation on this.

[0212] In this embodiment, the pressure relief mechanism 111 is located in the spaced area between two adjacent support plates 2131. This allows the battery cell 11 to undergo a relatively large degree of expansion and deformation in the area corresponding to the exhaust path during thermal runaway, thereby helping to improve the smoothness of exhaust.

[0213] In some embodiments, refer to Figure 9 The battery cell 11 has two pole posts 112 distributed along the second direction, and the pressure relief mechanism 111 is located between the two pole posts 112. In the projection plane perpendicular to the first direction, the pole posts 112 are located within the length range of the support plate 2131 along the second direction.

[0214] In this embodiment, the terminal post 112 of the battery cell 11 is located within the support range of the support plate 2131. In this way, the exhaust smoothness under thermal runaway conditions can be improved while taking into account the deformation resistance requirements of the side beam 21 under normal operating conditions.

[0215] In some embodiments, in a projection plane perpendicular to the first direction, along the second direction, the length of the support plate 2131 extending along a battery cell 11 is not less than 1 / 4 of the length of the battery cell 11 and does not exceed 1 / 2 of the length of the battery cell 11.

[0216] In this embodiment, this configuration can improve the smoothness of exhaust under thermal runaway conditions while also taking into account the deformation resistance requirements of the side beam 21 under normal operating conditions.

[0217] In some embodiments, as mentioned above, the first support 213 includes an extension plate 2132, in which case, referring to... Figure 5 and Figure 6 The first wall 22 includes an insulating structure layer 2a and a fiber composite material layer 2b stacked together. Along the thickness direction of the first wall 22, the insulating structure layer 2a is located between the fiber composite material layer 2b and the battery cell 11, and the extension plate 2132 is located between the insulating structure layer 2a and the fiber composite material layer 2b of the first wall 22.

[0218] Here, the insulating structure layer 2a and the fiber composite material layer 2b are stacked, specifically, both the insulating structure layer 2a and the fiber composite material layer 2b are plate-shaped structures. When projected along the thickness direction of the plate-shaped structure, the projections of the insulating structure layer 2a and the fiber composite material layer 2b overlap at least partially, so that the insulating structure layer 2a and the fiber composite material layer 2b are stacked together to form an integral laminate.

[0219] It should be noted that, apart from the first wall 22, other structural walls and beams (including side beams 21) of the enclosure can also adopt a similar structure. Taking the first wall 22 as an example, the insulating structural layer 2a and the composite material layer included in the first wall 22 can be integrally bonded together, or they can be partially connected, forming gaps or cavities in some locations. In addition, the first wall 22 can also include one or more laminates, or different wall surfaces of the structural wall can be formed by bending a laminate.

[0220] In this embodiment and in other embodiments mentioned below, the insulating structure layer 2a can be made of a single material, or it can be made of fiber composite material or other composite materials. The fiber composite material layer 2b is made of fiber composite material.

[0221] The main difference between the insulating structural layer 2a and the fiber composite layer 2b is that the insulating structural layer 2a is insulating at least on the side surface facing the battery cell 11, while the fiber composite layer 2b may be non-insulating, or it may be partially or completely insulating.

[0222] In an example where both the insulating structure layer 2a and the fiber composite material layer 2b are made of fiber composite materials, the fibers in the insulating structure layer 2a and the fiber composite material layer 2b can be the same, such as at least one of glass fiber, basalt fiber, aramid fiber, ceramic fiber, carbon fiber, and polyethylene fiber. In this embodiment, if the fibers in the fiber composite material layer 2b of the insulating structure layer 2a include carbon fiber or other conductive fibers, an insulating coating can be applied to the surface of the insulating structure layer 2a facing the battery cell 11 to achieve insulation.

[0223] The fibers in the insulating structural layer 2a and the fiber composite material layer 2b can also be different. For example, the fibers of the fiber composite material in the insulating structural layer 2a may include at least one of glass fiber, basalt fiber, and aramid fiber. All of these fibers are insulating fibers. Therefore, in this embodiment, the insulating structural layer 2a may not require an insulating coating. The fibers of the fiber composite material in the fiber composite material layer 2b may include at least one of carbon fiber and polyethylene fiber.

[0224] The insulating structure layer 2a is located between the fiber composite material layer 2b and the battery cell 11. That is, the insulating structure layer 2a is located on the side of the first wall 22 facing the battery cell 11. Specifically, the insulating structure layer 2a can be provided as a whole on the side of the first wall 22 facing the battery cell 11, or the insulating structure layer 2a can be provided only on a part of the side of the first wall 22 facing the battery cell 11. It can be understood that the insulating layer provided as a whole has a better insulation effect.

[0225] Furthermore, the extension plate 2132 is located between the insulating structural layer 2a and the fiber composite material layer 2b of the first wall 22, and the extension plate 2132 can be connected to at least one of the insulating structural layer 2a and the fiber composite material layer 2b of the first wall 22.

[0226] In this embodiment, the insulating structural layer 2a serves both to support the battery cell 11 and to electrically isolate the battery cell 11 from the outside world, reducing external interference to the battery cell 11. The combination of the insulating structural layer 2a and the fiber composite material layer 2b helps the housing assembly 2 to balance structural strength and protective performance. The extension plate 2132, located between the insulating structural layer 2a and the fiber composite material layer 2b, improves the positional stability of the extension plate 2132 and enhances the connection and integrity between the first wall 22 and the side beam, thus contributing to improved structural strength of the housing assembly 2.

[0227] In some embodiments, the battery cell 11 has a pressure relief mechanism 111, and the battery cell 11 is arranged such that the pressure relief port of the pressure relief mechanism 111 faces the first wall 22, as shown in the figure. Figure 6 The first wall 22 has a through hole 22a at a position corresponding to the pressure relief mechanism 111. The extension plate 2132 has a clearance notch 2132a and is projected onto the same projection plane along the thickness direction of the first wall 22. The projection of the pressure relief port of the pressure relief mechanism 111 is located within the projection of the clearance notch 2132a and within the projection of the through hole 22a.

[0228] The specific structural form of the pressure relief mechanism 111 can be referred to the description in the relevant part above. The difference is that the pressure relief mechanism 111 mentioned above can be set towards the first wall 22 or away from the first wall 22. In this embodiment, the pressure relief mechanism 111 is set away from the first wall 22.

[0229] The first wall 22 has a through hole 22a corresponding to the pressure relief port of the pressure relief mechanism 111. The through hole 22a can correspond to a single battery cell 11 or multiple battery cells 11 in the battery cell group 10.

[0230] The extension plate 2132 is provided with a clearance notch 2132a. Projected along the thickness direction (i.e., the third direction) of the first wall 22, the projection of the pressure relief port is located within the projection of the clearance notch 2132a, and the projection of the pressure relief port is located within the projection of the through hole 22a. In other words, the projections of the through hole 22a and the clearance notch 2132a completely cover the projection of the pressure relief port. The projections of the through hole 22a and the clearance notch 2132a may partially overlap or completely overlap.

[0231] In this embodiment, since the projections of the clearance notch 2132a and the through hole 22a completely cover the projection of the pressure relief port, the pressure relief airflow ejected from the pressure relief port passes through the through hole 22a and the first clearance notch 2132a through the first wall 22, and is less likely to impact the first wall 22 or its structure, so as to protect the housing assembly 2 and other battery cells 11 therein, and reduce the probability of heat diffusion.

[0232] In some implementations, as mentioned above, the first support 213 includes a reinforcing structure 2133. In this embodiment, specifically, the housing assembly 2 includes a first wall 22, the battery cell 11 is supported on the first wall 22, and the reinforcing structure 2133 includes a first reinforcing rib 2133a, which extends along the thickness direction (i.e., the third direction) of the first wall 22.

[0233] As an example, the first reinforcing rib 2133a may extend from one end of the support plate 2131 to the other end in a third direction.

[0234] In this embodiment, the reinforcing ribs include a first reinforcing rib 2133a extending in a third direction, which helps to further improve the deformation resistance of the support plate 2131.

[0235] In some embodiments, refer to Figure 10 The support plate 2131 forms a top flange 2131a at one end away from the first wall 22. The top flange 2131a extends in the direction away from the battery cell 11 along the first direction. One end of the first reinforcing rib 2133a is connected to the top flange 2131a.

[0236] In this embodiment, the support plate 2131 forms a top flange 2131a at one end away from the first wall 22 and in the direction away from the battery cell 11. One end of the first reinforcing rib 2133a is connected to the top flange 2131a. In this way, the stress distribution of the support plate 2131 can be further improved, thereby enhancing the deformation resistance of the side beam 21.

[0237] In addition, in some embodiments, the side beam 21 may include the second plate 214 mentioned above and the third plate 216. The third plate 216 connects the end of the first plate 211 away from the first wall 22 in a third direction and the end of the second plate 214 away from the first wall 22 in a first direction. In this embodiment, the top flange 2131a may abut against the third plate 216, thereby also serving to support the third plate 216.

[0238] In some embodiments, refer to Figure 10The first support body 213 also includes a connecting plate 2134. The connecting plate 2134 is connected to the first support plate 2131 on the side away from the battery cell 11 along the first direction and extends along the first direction. The thickness direction of the connecting plate 2134 is the thickness direction of the first wall 22. The connecting plate 2134 is located on the side of the top flange 2131a close to the first wall 22. The other end of the first reinforcing rib 2133a is connected to the connecting plate 2134.

[0239] It is understood that the thickness direction of the connecting plate 2134 is the third direction. The connecting plate 2134 is used to support one end of the first reinforcing rib 2133a. In addition, the connecting plate 2134 may also be used to connect with the external structure of the battery device 100.

[0240] The connection method between the connecting plate 2134 and the support plate 2131 is not limited, such as bonding, welding, snap-fitting, fastener connection, etc. Alternatively, the connecting plate 2134 and the support plate 2131 can form an integral structure. The materials of the connecting plate 2134 and the support plate 2131 can be the same or different.

[0241] The specific location of the connecting plate 2134 is not limited. For example, it can be set at the end of the support plate 2131 away from the top flange 2131a along the third direction.

[0242] The specific dimensions of the connecting plate 2134 are not limited. As an example, along the first direction away from the support plate 2131, the end of the connecting plate 2134 may be approximately flush with the end of the top flange 2131a, or the end of the connecting plate 2134 may extend beyond the end of the top flange 2131a.

[0243] When there are multiple support plates 2131, there are also multiple connecting plates 2134, and each support plate 2131 has at least one connecting plate 2134 on the side away from the battery cell 11.

[0244] In this embodiment, the two ends of the first reinforcing rib 2133a along the third direction are respectively connected to the top flange 2131a and the connecting plate 2134. The three cooperate with each other to form an "I" shaped structure on the back of the support plate 2131, thereby further improving the structural strength of the support plate 2131 and thus improving the deformation resistance of the side beam 21.

[0245] Furthermore, in the embodiment where the first support 213 includes an extension plate 2132, the connecting plate 2134 and the extension plate 2132 are respectively connected to opposite sides of the support plate 2131 along the first direction. In this way, the two can balance the stress distribution of the support plate 2131, reduce the possibility of the support plate 2131 tilting and deforming, and thus improve the deformation resistance of the side beam 21.

[0246] In some embodiments, refer to Figure 10 The angle α between the edge of the first reinforcing rib 2133a away from the support plate 2131 along the first direction and the surface of the connecting plate 2134 along the thickness direction (i.e., the third direction) is less than 90°.

[0247] In this embodiment, the specific angle α is not limited. As an example, α is greater than or equal to 60° and less than 90°, such as 60°, 65°, 70°, 75°, 80°, 85°, 88°, etc. More specifically, α is greater than or equal to 75° and less than 85°, such as 75°, 76°, 77°, 78°, 79°, 80°, 81°, 82°, 83°, 84°, 85°, etc.

[0248] In this embodiment, the angle between the edge of the first reinforcing rib 2133a away from the support plate 2131 along the first direction and the surface of the connecting plate 2134 along the thickness direction is an acute angle. This helps to transfer more of the force borne by the first reinforcing rib 2133a to the connecting plate 2134, optimizes the stress distribution of the first support 213, and further improves the deformation resistance of the side beam 21.

[0249] In some embodiments, the housing assembly 2 further includes a mounting plate 24, which is located on the side of the side beam 21 away from the battery cell 11 and is spaced apart from and opposite to the side beam 21 along a first direction. A connecting plate 2134 is connected to the mounting plate 24.

[0250] Here, the mounting plate 24 is mainly used to achieve the connection with the external structure. The structural form of the mounting plate 24 can be determined by those skilled in the art according to the actual connection requirements, and there are no restrictions on it.

[0251] The mounting plate 24 is spaced apart from and opposite to the side beam 21 along the first direction. Specifically, the mounting plate 24 forms a gap with the side beam 21 along the first direction, and when projected onto the same projection plane along the first direction, the projection of the mounting plate 24 and the projection of the side beam 21 at least partially overlap.

[0252] As an example, the mounting plate 24 extends along a second direction, and along the second direction, the two ends of the mounting plate 24 are approximately flush with the two ends of the side beam 21.

[0253] In the two side beams 21 of the housing assembly 2, only one side beam 21 may have a mounting plate 24 on the side away from the battery cell 11, or at least one mounting plate 24 may be provided on the side away from the battery cell 11 of each of the two side beams 21.

[0254] The specific material of the mounting plate 24 is not limited. As an example, at least a portion of the structure of the mounting plate 24 is made of fiber composite material.

[0255] The connection method between the connecting plate 2134 and the mounting plate 24 is not limited, such as bonding, snap-fitting, threaded connection, or riveting. Alternatively, the connecting plate 2134 can form an integral structure with at least a part of the structure of the mounting plate 24.

[0256] In this embodiment, the mounting plate 24 is connected to the connecting plate 2134, which further enhances the structural strength of the mounting plate 24 and improves its stability when connected to the external structure. Furthermore, a groove-shaped space is formed between the mounting plate 24 and the side beam 21, which can be used to install control elements of the battery device 100, and / or external structures, etc.

[0257] In some other embodiments, the mounting plate 24 may not be provided, and the connecting plate 2134 may be used to connect to an external structure.

[0258] In some embodiments, refer to Figure 11 and Figure 12 The bottom end of the first reinforcing rib 2133a extends from one end of the connecting plate 2134 along the first direction to the other end.

[0259] In this embodiment, the first reinforcing rib 2133a can also improve the structural strength of the connecting plate 2134, so that the connecting plate 2134 can better withstand the force from the mounting plate 24.

[0260] In some embodiments, refer to Figure 11 and Figure 12 Multiple first reinforcing ribs 2133a are spaced apart on the support plate 2131 along the second direction, which intersects with the first direction. Along the second direction, a battery cell 11 has two battery shoulders and a battery center. The battery center is connected to the two battery shoulders and located between the two battery shoulders. The distance between two adjacent first reinforcing ribs 2133a located in the battery center is t1, and the distance between two adjacent first reinforcing ribs 2133a located in the battery shoulders is t2, where t1 < t2.

[0261] In this embodiment, the specific values ​​of t1 and t2 can be determined based on simulation analysis. As an example, a first reinforcing rib 2133a can be provided at both ends of the battery cell 11 along the second direction and at both ends of the pressure relief mechanism 111 along the second direction.

[0262] In this embodiment, the first reinforcing ribs 2133a are relatively densely distributed in the middle of the battery and relatively sparsely distributed in the shoulder of the battery. This is because the thermal expansion is more pronounced in the middle of the battery compared to the shoulder. This arrangement helps to reduce the surface pressure difference (e.g., controlling it to no more than 0.4 MPa) of the surface of the battery cell 11 along the first direction when the battery cell 11 expands, thereby minimizing stress concentration during the expansion of the battery cell 11.

[0263] In some embodiments, the reinforcing structure 2133 includes a second reinforcing rib 2133b, which extends along a second direction that intersects with a first direction, and at least one end of the second reinforcing rib 2133b along the second direction is connected to the first reinforcing rib 2133a.

[0264] As an example, the thickness direction of the second reinforcing rib 2133b is the third direction. The second reinforcing rib 2133b can be connected to the first reinforcing rib 2133a at only one end along the second direction, or it can be connected to different first reinforcing ribs 2133a.

[0265] In this embodiment, a second reinforcing rib 2133b is further added. The extension direction of the second reinforcing rib 2133b intersects with that of the first reinforcing rib 2133a. The two work together to further enhance the structural strength of the support plate 2131, thereby improving the deformation resistance of the side beam 21.

[0266] In some embodiments, as mentioned above, the side beam 21 includes a second plate 214 located on the side of the support structure 212 away from the first plate 211 along the first direction. The support structure 212 also includes a second support body 215 located between the support plate 2131 and the second plate 214. In this embodiment, a plurality of first reinforcing ribs 2133a are spaced apart on the support plate 2131 along the second direction, which intersects with the first direction. Along the second direction, a second support body 215 is provided between two adjacent first reinforcing ribs 2133a.

[0267] The specific structural form of the second support 215 can be referred to the description in the relevant section above, and will not be repeated here.

[0268] In this embodiment, a second support body 215 is provided in the gap between two adjacent first reinforcing ribs 2133a. In this way, the second support body 215 can not only support the second plate 214, but also provide support for the first reinforcing ribs 2133a. This further improves the structural strength of the support plate 2131, thereby improving the deformation resistance of the side beam 21.

[0269] In some embodiments, the two ends of the second support 215 along the second direction abut against the first reinforcing rib 2133a; and / or the two ends of the second support 215 along the first direction abut against the support plate 2131 and the second plate 214, respectively.

[0270] In this embodiment, the abutment between the two ends of the second support body 215 along the second direction and the first reinforcing rib 2133a helps the second support body 215 to better support the first reinforcing rib 2133a, further improving the deformation resistance of the side beam 21. The abutment between the two ends of the second support body 215 along the first direction and the support plate 2131 and the second plate 214 respectively helps the second support body 215 to better support the second plate 214 and the support plate 2131.

[0271] In some embodiments, the first support 213 includes a first fiber fabric and a first substrate, the first fiber fabric including a plurality of first fibers. The first fibers include at least one of carbon fiber and polyethylene fiber; and / or the first substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0272] That is, in this embodiment, the first support 213 includes a fiber composite material, the first fiber fabric is a reinforced version of the fiber composite material, and the first matrix is ​​a reinforcing phase of the fiber composite material.

[0273] The first support 213 may have only a portion of its structure made of the fiber composite material and another portion made of other materials, or the entire structure of the first support 213 may be made of the fiber composite material; there is no limitation on this.

[0274] The first fiber fabric specifically refers to a fabric woven from the first fiber. Here, the specific weaving method is not limited, such as plain weave, twill weave, satin weave, multi-axial weave, etc.

[0275] The first support 213 may include multiple layers of first fiber fabric stacked together. The specific number of layers of the first fiber fabric is not limited. The number of layers of the first fiber fabric at different positions of the first support 213 may be the same or different, and there is no restriction on this.

[0276] In this embodiment, the first support 213 is further configured to include fiber composite material, which can further reduce the weight of the housing assembly 2 and increase the energy density of the battery device 100.

[0277] Furthermore, since the first support 213 does not require insulation, the first fiber of the first support 213 includes at least one of carbon fiber and polyethylene fiber. Compared with other optional fibers mentioned above, the above two fibers have higher structural strength and lower weight, which helps to further reduce weight and improve the deformation resistance of the side beam 21.

[0278] Furthermore, in the first support 213, the first fiber forms a first fiber fabric, thereby enabling the first support 213 to have good structural strength in multiple directions.

[0279] It should be noted that in some other embodiments, the first fiber may also include other fibers mentioned above.

[0280] In some embodiments, as mentioned above, the first support 213 further includes an extension plate 2132 connected to the support plate 2131. The extension plate 2132 is connected to the side of the support plate 2131 facing the battery cell 11 and extends in a first direction. In this embodiment, at least a portion of the first fiber fabric extends from the support plate 2131 to the extension plate 2132.

[0281] In this embodiment, by extending at least a portion of the first fiber fabric from the support plate 2131 to the extension plate 2132, the support plate 2131 and the extension plate 2132 can be formed into an integral structure, thereby improving the connection strength between the two. This further enhances the support capacity of the extension plate 2132 and the deformation resistance of the side beam 21.

[0282] In some embodiments, as mentioned above, the first support 213 further includes a reinforcing structure 2133 disposed on the side of the support plate 2131 opposite to the battery cell 11 along a first direction. In this embodiment, at least a portion of the first fiber fabric extends from the support plate 2131 to the reinforcing structure 2133.

[0283] In this embodiment, by extending at least a portion of the first fiber fabric from the support plate 2131 to the reinforcing structure 2133, the support plate 2131 and the reinforcing structure 2133 can be formed into an integral structure. This enhances the reinforcing effect of the reinforcing structure 2133 on the structural strength of the support plate 2131, thereby improving the structural strength of the support plate 2131 and thus enhancing the deformation resistance of the side beam 21.

[0284] In some embodiments, at least a portion of the first fiber fabric extends from the support plate 2131 to the reinforcing structure 2133 and the extension plate 2132, thereby forming the reinforcing structure 2133, the support plate 2131, and the extension plate 2132 into an integrated structure, thereby improving the structural strength of the first support 213.

[0285] In some embodiments, as mentioned above, the support plate 2131 forms a top flange 2131a and / or the first support body 213 includes a connecting plate 2134. In this embodiment, at least a portion of the first fiber fabric can extend from the support plate 2131 to the top flange 2131a and / or at least a portion of the first fiber fabric can extend from the support plate 2131 to the connecting plate 2134, thereby forming the above structure as an integral structure.

[0286] Furthermore, in some embodiments, as mentioned above, the reinforcing structure 2133 includes a first reinforcing rib 2133a, one end of which is connected to the top flange 2131a in a third direction, and the other end is connected to the connecting plate 2134. In this embodiment, at least a portion of the first fiber fabric can extend from the first reinforcing rib 2133a to the top flange 2131a and / or the connecting plate 2134.

[0287] In some embodiments, as mentioned above, the reinforcing structure 2133 includes a second reinforcing rib 2133b, at least one end of which is connected to the first reinforcing rib 2133a along a second direction. In this embodiment, at least a portion of the first fiber fabric can extend from the first reinforcing rib 2133a to the second reinforcing rib 2133b.

[0288] In some embodiments, refer to Figure 19 The battery device 100 also includes a fiber composite tension plate 3, which includes a main body 3a and a connecting part 3b. The connecting part 3b is located at both ends of the main body 3a along the first direction and is connected to the side beam 21.

[0289] Here, fiber composite sheet 3 specifically refers to a structure in which at least a portion of the fiber composite sheet 3 is made of fiber composite material. The fiber composite material can be any of the fiber composite materials mentioned in any of the above embodiments, and there is no limitation thereto.

[0290] As an example, the fiber composite material of the fiber composite plate 3 includes a reinforcing phase and a matrix phase. The reinforcing phase includes fibers selected from at least one of glass fiber, basalt fiber, and aramid fiber. The matrix phase includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. This gives the fiber composite plate 3 good structural strength and insulation properties (the fiber composite plate 3 may directly or indirectly contact the battery cell 11). In some examples, at least a portion of the fibers in the fiber composite material of the fiber composite plate 3 are continuous fibers. In the main body 3a, the fibers extend along a first direction; that is, at least a portion of the fibers in the fiber composite plate 3 are formed as unidirectional bands, thus improving the structural strength of the fiber composite plate 3 along the first direction.

[0291] The main body 3a can be the part that contacts the fiber composite tension plate 3 with the battery cell 11 and limits the position of each battery cell 11 in the battery cell group 10. The main body 3a can be in direct or indirect contact with the battery cell 11.

[0292] One or more surfaces of the battery cell pack 10 may be provided with the main body portion 3a. Here, the surface of the battery cell pack 10 may be a surface that is away from the first wall 22 along the first direction, or it may be a surface along the first direction or the second direction.

[0293] As an example, the surface of the battery cell assembly 10 facing away from the first wall 22 and the surface of the battery cell assembly 10 along the second direction are both provided with a main body portion 3a.

[0294] The connecting part 3b is the part that connects the fiber composite pull plate 3 to the box assembly 2. The connection between the connecting part 3b and the box assembly 2 can be welding, bonding, threaded connection, snap-fit, riveting, etc.

[0295] The connecting part 3b can be connected to any position of the side beam 21, such as the side of the side beam 21 facing the battery cell 11 in the first direction, the side of the side beam 21 away from the battery cell 11 in the first direction, the side of the side beam 21 away from the first wall 22 in the third direction, etc.

[0296] In this embodiment, the battery device 100 is provided with a fiber composite tension plate 3. While reducing weight, the fiber composite tension plate 3 effectively limits the battery cell assembly 10 through the main body 3a and the connecting part 3b, which can restrict the expansion of the battery cell assembly 10. The connecting part 3b of the fiber composite tension plate 3 is connected to the side beam 21 so that part of the expansion force borne by the side beam 21 can be transmitted to the fiber composite tension plate 3. In other words, the fiber composite tension plate 3 can share the expansion force of the battery cell 11 with the side beam 21, thereby improving the modulus and strength of the housing assembly 2, especially improving the modulus of the housing assembly 2 along the first direction, and reducing the probability of bending deformation of the side beam 21 and / or reducing the amount of deformation when the side beam 21 bends.

[0297] In some embodiments, still refer to Figure 19 The housing assembly 2 includes a first wall 22, on which battery cells 11 are supported, and side beams 21 are connected to opposite ends of the first wall 22 along a first direction. The fiber composite pull plate 3 includes at least one first pull plate 31, which covers at least a portion of the terminal posts 112 of the battery cell assembly 10 from the side opposite to the first wall 22.

[0298] It should be noted that the first pull plate 31 covering the battery cell group 10 can be a part of the battery cell group 10 covered by the first pull plate 31, that is, when projected along a third direction, the projection of the first pull plate 31 overlaps with the projection of the battery cell group 10; or the first pull plate 31 covering the entire battery cell group 10, that is, when projected along a third direction, the projection of the first pull plate 31 overlaps with the projection of the battery cell group 10 as a whole.

[0299] Furthermore, the first pull plate 31 can cover one or more battery cell groups 10. In some examples, the housing assembly 2 is provided with multiple battery cell groups 10, which are distributed along the second direction to form a battery cell array 1. Adjacent battery cell groups 10 in the battery cell array 1 share a first pull plate 31. Alternatively, in other examples, the first pull plate 31 partially or completely covers a single battery cell group 10.

[0300] In this embodiment, the first pull plate 31 covers the terminal post 112 side of the battery cell assembly 10 from the side away from the first wall 22, and can provide a limit for the battery cell assembly 10 in the thickness direction (i.e., the third direction) of the first wall 22 so as to fix the battery cell assembly 10 to the housing assembly 2. The first pull plate 31 can also resist the expansion force of the battery cell 11 along the thickness direction (i.e., the third direction) of the first wall 22.

[0301] In some embodiments, still refer to Figure 19 The fiber composite sheet 3 includes at least one second sheet 32, which covers at least a portion of the battery cell assembly 10 along a second direction that intersects with the first direction.

[0302] Here, the second pull plate 32 covers at least a portion of the battery cell group 10 along the second direction. This can be because the projection of the second pull plate 32 along the second direction partially overlaps with the projection of the battery cell group 10; or the projection of the second pull plate 32 completely overlaps with the projection of the battery cell group 10.

[0303] In this embodiment, the second pull plate 32 can cover at least a portion of the battery cell group 10 along the second direction, thereby bearing the expansion force of the battery cell 11 along the second direction, thereby further improving the modulus and strength of the housing assembly 2. The second pull plate 32 is connected to the side beam 21, which can further improve the deformation constraint force on the side beam 21, thereby further improving the structural strength of the housing assembly 2.

[0304] In some embodiments, still refer to Figure 19 Multiple battery cell groups 10 are arranged along a second direction to form a battery cell array 1, and the second direction intersects with the first direction; there are at least two second pull plates 32, and the battery cell array 1 is covered on both sides along the second direction.

[0305] In this embodiment, the second pull plate 32 covers the surface of the battery cell array 1 along the second direction. The second pull plate 32 and the first pull plate 31 form an enclosing structure. The two can provide limiting for the battery cell array 1 from multiple directions in order to improve the structural strength of the housing assembly 2.

[0306] In some embodiments, the side beam 21 includes an insulating structural layer 2a and a fiber composite material layer 2b stacked together, with at least a portion of the insulating structural layer 2a located between the fiber composite material layer 2b and the battery cell 11, and at least a portion of the first plate 211 being formed by the insulating structural layer 2a.

[0307] Here, the insulating structure layer 2a and the fiber composite material layer 2b are stacked, specifically, both the insulating structure layer 2a and the fiber composite material layer 2b are plate-shaped structures. When projected along the thickness direction of the plate-shaped structure, the projections of the insulating structure layer 2a and the fiber composite material layer 2b overlap at least partially, so that the insulating structure layer 2a and the fiber composite material layer 2b are stacked together to form an integral laminate.

[0308] As mentioned above, the insulating structural layer 2a can be made of a single material, or it can be made of fiber composite material or other composite materials. The fiber composite layer 2b is made of fiber composite material.

[0309] The main difference between the insulating structural layer 2a and the fiber composite layer 2b is that the insulating structural layer 2a is insulating at least on the side surface facing the battery cell 11, while the fiber composite layer 2b may be non-insulating, or it may be partially or completely insulating.

[0310] In an example where both the insulating structure layer 2a and the fiber composite material layer 2b are made of fiber composite materials, the fibers in the insulating structure layer 2a and the fiber composite material layer 2b can be the same, such as at least one of glass fiber, basalt fiber, aramid fiber, ceramic fiber, carbon fiber, and polyethylene fiber. In this embodiment, if the fibers in the fiber composite material layer 2b of the insulating structure layer 2a include carbon fiber or other conductive fibers, an insulating coating can be applied to the surface of the insulating structure layer 2a facing the battery cell 11 to achieve insulation.

[0311] The fibers in the insulating structural layer 2a and the fiber composite material layer 2b can also be different. For example, the fibers of the fiber composite material in the insulating structural layer 2a may include at least one of glass fiber, basalt fiber, and aramid fiber. All of these fibers are insulating fibers. Therefore, in this embodiment, the insulating structural layer 2a may not require an insulating coating. The fibers of the fiber composite material in the fiber composite material layer 2b may include at least one of carbon fiber and polyethylene fiber.

[0312] The insulating structure layer 2a is located between the fiber composite material layer 2b and the battery cell 11. At least a portion of the first plate 211 is formed by the insulating structure layer 2a, thereby insulating the first plate 211 from the battery cell 11.

[0313] As mentioned above, in some embodiments, the first wall 22 includes an insulating structural layer 2a and a fiber composite material layer 2b stacked together. In this embodiment, the insulating structural layer 2a of the side beam 21 can be connected to the insulating structural layer 2a of the first wall 22, and / or the fiber composite material layer 2b of the side beam can be connected to the fiber composite material layer 2b of the first wall 22. The specific implementation of the connection is not limited, such as bonding, welding, snap-fitting, etc., or the two can form an integral structure.

[0314] As mentioned above, in some embodiments, the side beam 21 includes a second plate 214 and / or a third plate 216. In such embodiments, at least a portion of the second plate 214 may be formed of a fiber composite material layer 2b, or a portion of the second plate 214 may be formed of a fiber composite material layer 2b and another portion of the second plate 214 may be formed of an insulating structural layer 2a. At least a portion of the third plate 216 may be formed of an insulating structural layer 2a, or at least a portion of the third plate 216 may be formed of a fiber composite material layer 2b, or a portion of the third plate 216 may be formed of a fiber composite material layer 2b and another portion of the third plate 216 may be formed of an insulating structural layer 2a.

[0315] In this embodiment, the side beam 21 includes an insulating structure layer 2a and a fiber composite material layer 2b stacked together. At least a portion of the first plate 211 is formed by the insulating structure layer 2a. In this way, the insulation requirements of the side beam 21 can be further met while reducing weight.

[0316] In some embodiments, refer to Figure 5 A hollow cavity 21a is formed between the insulating structure layer 2a and the fiber composite material layer 2b, and the supporting structure 212 is located in the hollow cavity 21a and abuts against the insulating structure layer 2a.

[0317] In this embodiment, the support structure 212 may only abut against the insulating structure layer 2a, or the support structure 212 may abut against both the insulating structure layer 2a and the fiber composite material layer 2b.

[0318] In this embodiment, the insulating structure layer 2a and the fiber composite layer are actually formed as the outer wall surface of the side beam 21, and at least a portion of the support structure 212 is covered by both. Specifically, the insulating structure layer 2a is formed as at least a portion of the outer wall surface of the side beam 21 facing the battery cell 11 (receiving cavity) along the first direction, while the fiber composite layer is formed as at least a portion of the outer wall surface of the side beam 21 away from the battery cell 11 (receiving cavity) along the first direction.

[0319] In this embodiment, the hollow cavity 21a provided in the side beam 21 can effectively reduce the weight of the side beam 21, which is beneficial to the lightweighting of the housing assembly 2. The hollow cavity 21a can also serve as a heat insulation layer, improving the thermal management performance of the battery device 100. Furthermore, a support structure 212 is provided in the hollow cavity 21a to provide support for the insulation layer 2a and the fiber composite material layer 2b, which can improve the deformation resistance of the insulation layer 2a and the fiber composite material layer 2b. The support structure 212 can also disperse impacts and improve the structural stability of the housing assembly 2.

[0320] In some embodiments, refer to Figure 5 A portion of the insulating structural layer 2a of the side beam 21 is formed as a flange 2a', which is connected to the composite material layer to form a connecting layer 2c.

[0321] Here, the flange 2a' can be formed by bending or flanging, and the bent part of the flange 2a' can be an acute angle, a right angle, an obtuse angle, or a rounded corner.

[0322] In this embodiment, the insulating structure layer 2a and the fiber composite material layer 2b of the side beam 21 are connected by a connecting layer 2c. The connecting structure includes a flange 2a' formed by the insulating structure layer 2a, which helps to form a stable connecting layer 2c, improves the connection strength between the insulating structure layer 2a and the fiber composite material layer 2b, and thus improves the structural stability of the housing assembly 2.

[0323] In some embodiments, as mentioned above, the housing assembly 2 includes a first wall 22, the battery cell 11 is supported on the first wall 22, and the side beam 21 is connected to opposite ends of the first wall 22 along a first direction. In this embodiment, the connecting layer 2c is located at the end of the side beam 21 on the side opposite to the first wall 22 along the thickness direction (i.e., the third direction), or the connecting layer 2c is located on the side of the side beam 21 opposite to the battery cell 11 along the first direction.

[0324] In some examples, the connecting layer 2c is located at the end of the sidewall opposite to the first wall 22 along the thickness direction (i.e., the third direction). In other words, the connecting structure is located at the top of the sidewall (i.e., the connecting layer 2c is formed as part of the third plate 216 mentioned above), or the connecting layer 2c is located at the opening 215a of the housing assembly 2.

[0325] In other examples, the connecting layer 2c is located on the side of the side beam 21 facing away from the battery cell 11 along the first direction; in other words, the connecting layer 2c is formed as part of the second plate 214 mentioned above.

[0326] In this embodiment, the connecting layer 2c is disposed on the top or outside of the side beam 21 so that the insulating structure layer 2a extends to the outside of the housing assembly 2 and is then connected, so that the side beam 21 facing the battery cell 11 is entirely covered by the insulating structure layer 2a, which can reduce the impact of the connecting layer 2c on the internal structure of the cavity or the battery cell 11, and is also easier to assemble.

[0327] In some embodiments, in the connecting layer 2c, the flange 2a' overlaps with the fiber composite material layer 2b, or the flange 2a' is butt-jointed with the fiber composite material layer 2b.

[0328] Here, overlapping refers to the fact that the projections of two components along a certain direction at least partially overlap, and the two are connected to each other. For example, in the connecting layer 2c, the projection of the flange 2a' along the thickness direction at least partially overlaps with the projection of the fiber composite layer 2b along that direction, and the flange 2a' is connected to the fiber composite layer 2b by means of bonding, welding, abutment, riveting, etc.

[0329] In some examples, one of the flange 2a' and the fiber composite material is formed with a bent structure, which can be bent toward or away from the receiving cavity, and the other of the flange 2a' and the fiber composite material layer 2b overlaps with the bent structure.

[0330] Among them, the bending structure refers to the two connected parts of the component extending in different directions; for example, the flange 2a' located on the outside of the side beam 21 (the side not facing the receiving cavity) has a bending structure, the bending structure bends towards the receiving cavity, and then bends towards the corresponding insulating structure layer 2a; or, the fiber composite material layer 2b located on the outside of the side beam 21 bends away from the receiving cavity, and then bends towards the corresponding flange 2a'.

[0331] In this embodiment of the application, docking refers to two components being arranged opposite each other and connected to each other. For example, in the connecting layer 2c, along the extension direction of the flange 2a', the flange 2a' and the fiber composite material layer 2b are arranged opposite each other, that is, the projections of the two along the extension direction at least partially overlap, and the flange 2a' and the fiber composite material layer 2b can be connected by abutment, bonding, welding or other means.

[0332] In this embodiment, the bent flange 2a' and the fiber composite material layer 2b are joined by an overlapping structure, which has good sealing and connection performance, and can reduce the number of components and facilitate assembly; the flange 2a' and the fiber composite material layer 2b adopt a butt joint structure, which has good flatness and the structure of a single component is simpler.

[0333] In some embodiments, the housing assembly 2 further includes an overlap layer (not shown in the figure), in which the flange 2a' is mated to the fiber composite material layer 2b, and the overlap layer at least covers the mating seam between the flange 2a' and the fiber composite material layer 2b.

[0334] In this embodiment, the flange 2a' and the fiber composite material layer 2b are joined to form a joint. The joint can be a closed line that connects the beginning and the end, or it can be a non-closed line. The joint can be a straight line, a curve, or a combination of both. In some examples, the joint is a straight line and is set parallel to the extension direction of the first wall 22.

[0335] In this embodiment, the overlap layer may be connected to at least one of the insulating structural layer 2a and the fiber composite material. In some examples, the overlap layer connects the insulating structural layer 2a and the fiber composite material layer 2b, respectively.

[0336] In this embodiment, the overlapping layer can be located on the side of the flange 2a' / fiber composite material layer 2b away from the receiving cavity. For example, the overlapping layer is located on the outside of the side beam 21 relative to the receiving cavity; or, the overlapping layer can be located on the side of the flange 2a' / fiber composite material layer 2b close to the receiving cavity. For example, the overlapping layer is located in the hollow cavity 21a.

[0337] In this embodiment, by setting an overlap layer, the overlap layer can cover the joint between the flange 2a' and the fiber composite material layer 2b, which can improve the sealing effect and also help to improve the connection strength between the insulation structure layer 2a and the fiber composite material layer 2b.

[0338] In some embodiments, the insulating structure layer 2a includes a second fiber fabric, and the fiber composite material layer 2b includes a third fiber fabric. The second fiber fabric includes a plurality of second fibers, and the third fiber fabric includes a plurality of third fibers. The second fibers are different from the third fibers.

[0339] Here, the insulating structural layer 2a can refer to at least one of the insulating structural layer 2a of the first wall 22, the insulating structural layer 2a of the side beam 21, and the insulating structural layer 2a of the side plate 23. The fiber composite material layer 2b can refer to at least one of the fiber composite material layer 2b of the first wall 22, the fiber composite material layer 2b of the side beam 21, and the fiber composite material layer 2b of the side plate 23.

[0340] Here, the fiber fabric can be a structure woven from multiple fibers, and the weaving can be plain weave, twill weave, satin weave, etc. The second and third fiber fabrics can use the same or different weaving methods. The difference between the second and third fibers specifically refers to the different materials of the first and second fibers, and is not a limitation on the structure of the second and third fibers.

[0341] In this embodiment, the insulation structure includes a second fiber fabric woven from multiple second fibers, and the fiber composite material layer 2b includes a third fiber fabric woven from multiple third fibers. The fiber fabric has high structural strength and load-bearing capacity, which helps to improve the load-bearing and protective capacity of the housing assembly 2.

[0342] In some embodiments, the density of the third fiber is less than the density of the second fiber.

[0343] In some examples, the second fiber includes glass fiber, basalt fiber, aramid fiber, etc., and the third fiber includes carbon fiber, polyethylene fiber, etc. The densities of the various fibers, from smallest to largest, are polyethylene fiber density < aramid fiber density < carbon fiber density < glass fiber density < basalt fiber density.

[0344] In some examples, the third fiber is polyethylene fiber, and the second fiber is one or more of glass fiber, basalt fiber, and aramid fiber.

[0345] In some examples, the third fiber is carbon fiber, and the second fiber is one or more of glass fiber and basalt fiber.

[0346] In some examples, the second fiber is made of a high-density material, such as carbon fiber, which has good insulation properties. The third fiber is made of a low-density material, such as polyethylene fiber, which facilitates the lightweighting of the housing assembly 2.

[0347] In some examples, the insulating structural layer 2a and the fiber composite layer 2b use the same substrate, while the second and third fibers use different sealing fibers; in other examples, the insulating structural layer 2a and the fiber composite layer 2b may also use substrates of different densities, for example, the density of the substrate in the insulating structural layer 2a is less than the density of the substrate in the composite layer, which helps to reduce the weight of the insulating structural layer 2a.

[0348] In this embodiment, the insulating structure layer 2a is made of a material with a higher density, which helps to improve the insulation performance; the fiber composite material layer 2b is made of a material with a lower density, which helps to reduce weight and facilitates the lightweight design of the battery device 100.

[0349] In some embodiments, the second fiber includes at least one of glass fiber, basalt fiber, and aramid fiber; and / or, the third fiber includes at least one of carbon fiber and polyethylene fiber.

[0350] In some examples, the second fiber is glass fiber and the third fiber is carbon fiber. The fiber composite layer 2b made of glass fiber has advantages such as high strength, light weight, good insulation, and corrosion resistance; the insulating structural layer 2a made of carbon fiber has advantages such as high strength, low density, corrosion resistance, and good thermal stability.

[0351] In some examples, the second fiber is glass fiber and the third fiber is polyethylene fiber. The fiber composite layer 2b made of glass fiber has advantages such as high strength, light weight, good insulation, and corrosion resistance; the insulating structural layer 2a made of polyethylene fiber has advantages such as high strength and toughness, low density, and ease of processing.

[0352] In some examples, the second fiber is basalt fiber and the third fiber is carbon fiber. The fiber composite layer 2b made of basalt fiber has advantages such as good mechanical properties, good fire resistance and flame retardancy, strong insulation and electromagnetic shielding capabilities, and corrosion resistance; the insulating structural layer 2a made of carbon fiber has advantages such as high strength, low density, corrosion resistance, and good thermal stability.

[0353] In some examples, the second fiber is basalt fiber and the third fiber is polyethylene fiber. The fiber composite layer 2b made of basalt fiber has advantages such as good mechanical properties, good fire resistance and flame retardancy, strong insulation and electromagnetic shielding capabilities, and corrosion resistance; the insulating structural layer 2a made of polyethylene fiber has advantages such as high strength and toughness, low density, and ease of processing.

[0354] In some examples, the second fiber is aramid fiber and the third fiber is carbon fiber. The fiber composite layer 2b made of aramid fiber has advantages such as high strength, low density, impact resistance, good insulation, high temperature resistance, and easy processing; the insulating structural layer 2a made of carbon fiber has advantages such as high strength, low density, corrosion resistance, and good thermal stability.

[0355] In some examples, the second fiber is aramid fiber and the third fiber is polyethylene fiber. The fiber composite layer 2b made of aramid fiber has advantages such as high strength, low density, impact resistance, good insulation, high temperature resistance, and easy processing; the insulating structural layer 2a made of polyethylene fiber has advantages such as high strength and toughness, low density, and easy processing.

[0356] In this embodiment, the second and third fibers can be made of suitable materials as needed to be applied to a variety of different scenarios, thereby improving the adaptability of the battery device 100.

[0357] In some embodiments, the second fiber is glass fiber and the third fiber is carbon fiber. In this embodiment, the second fiber is glass fiber, and the glass fiber prepreg has the advantages of excellent insulation performance, high structural strength, and lightweight, so that the glass fiber-containing insulation layer 2a has better insulation performance, higher structural strength, and higher elasticity, which can meet the impact resistance requirements and lightweight design of the housing assembly 2; the third fiber is carbon fiber, and the carbon fiber composite material layer 2b has advantages such as high strength, low density, corrosion resistance, and good thermal stability, and is lightweight and has good structural strength, which can meet the impact resistance requirements and lightweight design of the housing assembly 2.

[0358] In some embodiments, the number of layers of the second fiber fabric in the insulating structure layer 2a is less than or equal to the number of layers of the third fiber fabric in the fiber composite material layer 2b.

[0359] In this embodiment, the number of layers of the second fiber fabric at different positions of the housing assembly 2a corresponding to the insulating structural layer 2a may be the same or different, and the number of layers of the second fiber fabric at different positions of the housing assembly 2b corresponding to the fiber composite material layer 2b may be the same or different. In some examples, the number of layers of the second fiber fabric in the insulating structural layer 2a of the first wall 22 and the insulating structural layer 2a of the side beam 21 is the same, and the number of layers of the third fiber fabric in the fiber composite material layer 2b of the first wall 22 and the fiber composite material layer 2b of the side beam 21 is the same, and the number of layers of the third fiber fabric is greater than the number of layers of the second fiber fabric.

[0360] In some examples, the number of layers of the third fiber fabric in the fiber composite layer 2b is equal to the number of layers of the second fiber fabric in the insulating structure layer 2a; in other examples, the number of layers of the second fiber fabric in the insulating structure layer 2a is less than the number of layers of the third fiber fabric in the fiber composite layer 2b.

[0361] In this embodiment, the insulation structure layer 2a has fewer layers of second fiber fabric, which helps to reduce material consumption and reduce the wall thickness of the housing assembly 2; the fiber composite material layer 2b has more layers of third fiber fabric, which helps to improve structural strength.

[0362] In some embodiments, the number of layers of the second fiber fabric in the insulating structure layer 2a is 1-3; and / or, the number of layers of the third fiber fabric in the fiber composite material layer 2b is 2-15.

[0363] In this embodiment, the insulation structure layer 2a has a larger number of second fiber fabric layers, which can provide better protective performance; the insulation structure layer 2a has a smaller number of second fiber fabric layers, which helps to reduce the weight of the housing assembly 2.

[0364] In some examples, the insulating structure layer 2a includes one layer of second fiber fabric; in other examples, the insulating structure layer 2a includes two layers of second fiber fabric; in still other examples, the insulating structure layer 2a includes three layers of second fiber fabric; two or more layers of second fiber fabric are connected as one unit.

[0365] In this embodiment, the fiber composite layer 2b has a larger number of third fiber fabric layers, which can provide better support performance; the fiber composite layer 2b has a smaller number of third fiber fabric layers, which helps to reduce the weight of the housing component 2.

[0366] In some examples, the number of layers of the third fiber fabric in the fiber composite layer 2b ranges from 2 to 15; for example, the third fiber fabric has 2, 5, 7, 10, 13, or 15 layers, etc. The specific number can be selected according to the needs.

[0367] In this embodiment, setting the number of layers of the second fiber fabric in the first insulation layer within a suitable range allows for a significant reduction in the weight of the housing assembly 2 while ensuring good insulation performance of the insulation structure layer 2a, thus facilitating the lightweight design of the housing assembly 2. Maintaining the number of layers of the third fiber fabric in the fiber composite layer 2b within a suitable range allows for minimizing the total thickness and weight of the fiber composite layer 2b while ensuring its structural strength.

[0368] In some embodiments, the second fiber is a continuous fiber, and at least a portion of the plurality of second fibers intersect each other; and / or, the third fiber is a continuous fiber, and at least a portion of the plurality of third fibers intersect each other.

[0369] In this embodiment, the fiber is a connecting fiber, meaning the fiber can extend to both opposite ends of the fiber fabric. Correspondingly, the second fiber can extend to both opposite ends of the second fiber fabric; the third fiber can extend to both opposite ends of the third fiber fabric.

[0370] In this embodiment of the application, the two fibers intersecting each other means that the two fibers extend in different directions (which can also be understood as the length direction of the fibers). The extension directions of the two fibers can be at a right angle, an acute angle, or an obtuse angle.

[0371] In this embodiment, at least some of the second fibers intersect each other, as shown in the reference. Figure 18 This can be achieved by having at least two intersecting second fibers within the same second fiber fabric, where the intersection of the two second fibers can be a plain weave, twill weave, or satin weave, etc.; or, refer to... Figure 19 In different second fiber fabrics, there are at least two intersecting second fibers.

[0372] In some examples, the insulating structure layer 2a includes one or more layers of second fiber fabric, each layer of second fiber fabric including at least two intersecting second fibers; in other examples, the insulating structure layer 2a includes two or more layers of second fiber fabric, multiple second fibers in the same second fiber fabric are arranged in parallel, and second fibers in at least two second fiber fabrics are intersecting.

[0373] In this embodiment, at least some of the third fibers intersect each other, as shown in the reference. Figure 18This can be achieved by having at least two intersecting third fibers within the same third fiber fabric, where the intersection of the two third fibers can be a plain weave, twill weave, or satin weave, etc.; or, refer to... Figure 19 In different third fiber fabrics, there are at least two intersecting third fibers.

[0374] In some examples, the fiber composite layer 2b includes one or more third fiber fabrics, each third fiber fabric including at least two intersecting third fibers; in other examples, the fiber composite layer 2b includes two or more third fiber fabrics, multiple third fibers in the same third fiber fabric are arranged in parallel, and the third fibers in at least two third fiber fabrics are intersecting.

[0375] In this embodiment, the continuously arranged second and third fibers have better structural integrity, thus providing better structural strength for the insulation layer 2a or the fiber composite layer 2b. The cross-arranged second and third fibers can enhance the structural strength of the second fiber fabric / third fiber braid, provide load-bearing capacity in multiple directions, and reduce the likelihood of the second fiber fabric / third fiber braid being torn.

[0376] In some embodiments, the insulating structural layer 2a includes a second substrate and a plurality of second fibers, wherein the second fibers are continuous fibers and at least a portion of the second fibers intersect each other; the second substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; the second fibers include at least one of glass fiber, basalt fiber, and aramid fiber; and / or, the fiber composite material layer 2b includes a third substrate and a plurality of third fibers, wherein the third fibers are continuous fibers and at least a portion of the third fibers intersect each other; the third substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; the third fibers include at least one of carbon fiber and polyethylene fiber.

[0377] In this embodiment of the application, at least some of the second fibers intersect each other. This can be because there are at least two intersecting second fibers in the same second fiber fabric, or at least two intersecting second fibers in different second fiber fabrics.

[0378] In some examples, the insulating structure layer 2a includes one or more layers of second fiber fabric, each layer of second fiber fabric including at least two intersecting second fibers; in other examples, the insulating structure layer 2a includes two or more layers of second fiber fabric, multiple second fibers in the same second fiber fabric are arranged in parallel, and second fibers in at least two second fiber fabrics are intersecting.

[0379] In some examples, the second substrate is one of polyurethane, epoxy resin, phenolic resin, polyamide resin, or ceramizable resin; in other examples, the second substrate is composed of two or more of polyurethane, epoxy resin, phenolic resin, polyamide resin, or ceramizable resin.

[0380] In some examples, the second fiber is either carbon fiber or polyethylene fiber; in other examples, the second fiber is a composite of carbon fiber and polyethylene fiber.

[0381] In some examples, the second substrate includes polyurethane, and the second fiber includes one or more of carbon fiber and polyethylene fiber. The second fiber fabric composed of polyurethane and the second fiber has advantages such as high elasticity, abrasion resistance and high tear strength.

[0382] In some examples, the second substrate includes epoxy resin, and the second fiber includes one or more of carbon fiber and polyethylene fiber. The second fiber fabric composed of epoxy resin and the second fiber has advantages such as good adhesion, high mechanical strength, and strong corrosion resistance.

[0383] In some examples, the second substrate includes phenolic resin, and the second fiber includes one or more of carbon fiber and polyethylene fiber. The second fiber fabric composed of phenolic resin and the second fiber has advantages such as good heat resistance and good flame retardancy.

[0384] In some examples, the second substrate includes polyamide resin, and the second fiber includes one or more of carbon fiber and polyethylene fiber. The second fiber fabric composed of polyamide resin and the second fiber has advantages such as high strength, good abrasion resistance, and good oil resistance.

[0385] In some examples, the second substrate includes a ceramizable resin, and the second fiber includes one or more of carbon fiber and polyethylene fiber. The second fiber fabric composed of the ceramizable resin and the second fiber has advantages such as good structural stability, high temperature resistance, and good flame retardancy.

[0386] In some examples, the second fiber includes carbon fiber, and the second substrate includes polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. The second fiber fabric composed of carbon fiber and the second substrate has advantages such as high strength, low density, corrosion resistance, and good thermal stability.

[0387] In some examples, the second fiber includes polyethylene fiber, and the second substrate includes polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. The second fiber fabric composed of polyethylene fiber and the second substrate has advantages such as high strength and toughness, low density, and ease of processing.

[0388] In this embodiment of the application, at least some of the third fibers intersect each other. This can be because there are at least two intersecting third fibers in the same third fiber fabric, or at least two intersecting third fibers in different third fiber fabrics.

[0389] In some examples, the fiber composite layer 2b includes one or more third fiber fabrics, each third fiber fabric including at least two intersecting third fibers; in other examples, the fiber composite layer 2b includes two or more third fiber fabrics, multiple third fibers in the same third fiber fabric are arranged in parallel, and the third fibers in at least two third fiber fabrics are intersecting.

[0390] In some examples, the third substrate is one of polyurethane, epoxy resin, phenolic resin, polyamide resin, or ceramizable resin; in other examples, the third substrate is composed of two or more of polyurethane, epoxy resin, phenolic resin, polyamide resin, or ceramizable resin.

[0391] In some examples, the third fiber is one of glass fiber, basalt fiber, and aramid fiber; in other examples, the third fiber is composed of two or more of glass fiber, basalt fiber, and aramid fiber.

[0392] In some examples, the third substrate includes polyurethane, and the third fiber includes one or more of glass fiber, basalt fiber, and aramid fiber. The third fiber prepreg composed of polyurethane and the third fiber has advantages such as high elasticity, abrasion resistance and high tear strength.

[0393] In some examples, the third substrate includes epoxy resin, and the third fiber includes one or more of glass fiber, basalt fiber, and aramid fiber. The third fiber prepreg composed of epoxy resin and third fiber has advantages such as good adhesion, high mechanical strength, and strong corrosion resistance.

[0394] In some examples, the third substrate includes phenolic resin, and the third fiber includes one or more of glass fiber, basalt fiber, and aramid fiber. The third fiber prepreg composed of phenolic resin and third fiber has advantages such as good heat resistance and good flame retardancy.

[0395] In some examples, the third substrate includes polyamide resin, and the third fiber includes one or more of glass fiber, basalt fiber, and aramid fiber. The third fiber prepreg composed of polyamide resin and third fiber has advantages such as high strength, good wear resistance, and good oil resistance.

[0396] In some examples, the third substrate includes a ceramizable resin, and the third fiber includes one or more of glass fiber, basalt fiber, and aramid fiber. The third fiber prepreg composed of the ceramizable resin and the third fiber has advantages such as good structural stability, high temperature resistance, and good flame retardancy.

[0397] In some examples, the third fiber includes glass fiber, and the third substrate includes polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. The third fiber prepreg composed of glass fiber and the third substrate has advantages such as high strength, light weight, good insulation, and corrosion resistance.

[0398] In some examples, the third fiber includes basalt fiber, and the third substrate includes polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. The third fiber prepreg composed of basalt fiber and third substrate has advantages such as good mechanical properties, good fire resistance and flame retardancy, strong insulation and electromagnetic shielding capabilities, and corrosion resistance.

[0399] In some examples, the third fiber includes aramid fiber, and the third substrate includes polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. The third fiber prepreg composed of aramid fiber and third substrate has advantages such as high strength, low density, impact resistance, good insulation, high temperature resistance, and easy processing.

[0400] In this embodiment, polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin are selected as the second substrate, which possesses excellent wear resistance, high toughness, adhesion, corrosion resistance, and heat resistance. Carbon fiber and polyethylene fiber are selected as the third fiber, which can reduce weight and provide higher strength. Using polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin as the third substrate provides excellent wear resistance, high toughness, adhesion, corrosion resistance, and heat resistance. Selecting glass fiber, basalt fiber, and aramid fiber as the second fiber can achieve good structural strength and insulation properties.

[0401] In this embodiment, the insulating structural layer 2a includes a second substrate and a second fiber, and the fiber composite material layer 2b includes a third substrate and a third fiber. The insulating structural layer 2a made of the second fiber has good insulation performance; the fiber composite material layer 2b made of the third fiber has the advantages of high support strength and lightweight. The combination of the two makes it easy for the housing assembly 2 to have both lightweight and protective performance.

[0402] In some embodiments, the thickness H1 of the insulating structure layer 2a is less than or equal to the thickness H2 of the fiber composite material layer 2b; and / or, the thickness H1 of the insulating structure layer 2a is in the range of 0.1 mm to 1.0 mm, and the thickness H2 of the fiber composite material layer 2b is in the range of 1.0 mm to 2.5 mm.

[0403] In this embodiment, the thickness H1 of the insulating structure layer 2a is its dimension along its own thickness direction. The thickness directions of the insulating structure layers 2a at different locations on the housing assembly 2 can be the same or different. For example, the thickness H1 of the insulating structure layer 2a provided on the first wall 22 is its dimension along the thickness direction (third direction Z) of the first wall 22; the thickness H1 of the insulating structure layer 2a provided on the inner or outer side of the side beam 21 is its dimension along the thickness direction (first direction) of the side beam 21.

[0404] In this embodiment, the insulation layer 2a has a larger thickness H1, which can provide better protection performance; the insulation layer 2a has a smaller thickness H1, which helps to reduce the weight of the housing assembly 2.

[0405] In some examples, the thickness H1 of the insulating structure layer 2a ranges from 0.1 mm to 1.0 mm. For example, the thickness H1 of the insulating structure layer 2a is 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 1.0 mm, etc.

[0406] In this embodiment, the thickness H2 of the fiber composite material layer 2b is its dimension along its own thickness direction. The thickness directions of the fiber composite material layer 2b at different positions of the housing assembly 2 can be the same or different. For example, the thickness H2 of the fiber composite material layer 2b provided on the first wall 22 is the dimension along the thickness direction (third direction) of the first wall 22; the thickness H2 of the fiber composite material layer 2b provided on the inner or outer side of the side beam 21 is the dimension along the thickness direction (first direction) of the side beam 21.

[0407] In this embodiment, the fiber composite layer 2b has a larger thickness H2, which can provide better support performance and resistance to deformation; the fiber composite layer 2b has a smaller thickness H2, which helps to reduce the weight of the housing component 2.

[0408] In some examples, the thickness H2 of the fiber composite layer 2b ranges from 1.0 mm to 2.5 mm. For example, the thickness H2 of the fiber composite layer 2b is 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, etc.

[0409] In some examples, the thickness H1 of the insulating layer 2a is less than the thickness H2 of the fiber composite layer 2b, for example, the thickness H1 of the insulating layer 2a is 0.5 mm and the thickness H2 of the fiber composite layer 2b is 1.0 mm; in other examples, the thickness H1 of the insulating layer 2a is equal to the thickness H2 of the fiber composite layer 2b, for example, the thickness H1 of the insulating layer 2a and the thickness H2 of the fiber composite layer 2b are both 1.0 mm.

[0410] In this embodiment, the thinner insulating layer 2a, while meeting insulation requirements, helps to reduce the wall thickness of the housing assembly 2 and lighten its weight; the thicker fiber composite material layer 2b helps to improve structural strength, so as to provide a more stable working environment for the battery cell 11.

[0411] In some embodiments, refer to Figure 3 and Figure 6 As mentioned above, the housing assembly 2 includes two side plates 23 arranged opposite each other along a second direction. The side plates 23 constrain the battery cell assembly 10. The second direction intersects with the first direction. The side beams 21 are connected to the two side plates 23 at opposite ends along the second direction. In this embodiment, the side plates 23 include an insulating structural layer 2a and a fiber composite material layer 2b stacked together. Along the second direction, the insulating structural layer 2a is located between the fiber composite material layer 2b and the battery cell 11.

[0412] The specific structural form of the side plate 23 can be referred to the structural form of the side beam 21 described above. The specific composition of the insulation layer 2a and the fiber composite material layer 2b of the side plate 23, as well as the connection method between them, can be referred to the relevant descriptions above, and will not be repeated here.

[0413] In this embodiment, two side plate components 23 are provided, which are disposed on both sides of the first wall 22 along the second direction. These side plates 23 can restrict the expansion force or deformation of the battery cell 11 along the second direction. Furthermore, the side plates 23 include an insulating structural layer 2a and a fiber composite material layer 2b, which helps to further reduce the weight of the housing assembly 2 and increase the energy density of the battery device 100. The insulating structural layer 2a further helps to electrically isolate the battery cell 11 from the outside environment.

[0414] In some embodiments, the side plate 23 is configured as a hollow structure with a hollow cavity located between the insulating structural layer 2a and the fiber composite material layer 2b of the side plate 23.

[0415] In this embodiment, the insulating structure layer 2a and the fiber composite layer are actually formed as the outer wall surface of the side plate 23. The insulating structure layer 2a is formed as at least a portion of the outer wall surface of the side plate 23 facing the battery cell 11 (receiving cavity) along the first direction, while the fiber composite layer is formed as at least a portion of the outer wall surface of the side plate 23 away from the battery cell 11 (receiving cavity) along the first direction.

[0416] In this embodiment, the hollow cavity provided in the side plate 23 can effectively reduce the weight of the side beam 21, which is beneficial to the lightweighting of the housing assembly 2. In addition, the hollow cavity can also serve as a heat insulation layer to improve the thermal management performance of the battery device 100.

[0417] In some embodiments, refer to Figure 15The side plate 23 also includes a third support 231, which is located in the hollow cavity of the side plate 23 and abuts against at least one of the insulating structural layer 2a and the fiber composite material layer 2b.

[0418] Here, the third support 231 is used to provide support. The third support 231 can be a block structure, a column structure, a plate structure, or a combination of multiple structures. The specific structure of the third support 231 can refer to the first support 213 and / or the second support 215 described above. Alternatively, the third support 231 can also be other structures different from the first support 213 and the second support 215, and there are no restrictions on this.

[0419] In this embodiment, a third support 231 is provided in the hollow cavity of the side plate 23. The third support 231 provides support for the insulation structure layer 2a and the fiber composite material layer 2b of the side plate 23, which can improve the deformation resistance of the insulation structure layer 2a and the fiber composite material layer 2b. The third support can also disperse impact and improve the structural stability of the box assembly 2.

[0420] Embodiments of this application also provide an electrical device that includes the battery device 100 described in any of the above embodiments. The electrical device of this application has all the advantages of the battery device 100 described in any of the above embodiments, which will not be repeated here.

[0421] In some embodiments, the electrical equipment includes aircraft, which generally refers to machinery that flies within or outside the atmosphere (space), and may include aircraft flying within the atmosphere and spacecraft flying in space. Aircraft may include airplanes, airships, etc., and for example, may be low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional aircraft, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0422] The battery device 100 and the electrical equipment in one or more of the above embodiments will be described in more detail and specific way with reference to a specific embodiment.

[0423] Reference Figures 1-19 The electrical equipment in this application embodiment includes an aircraft. By installing a battery device 100 on the aircraft, the battery device 100 can provide electrical power to the aircraft, enabling it to fly.

[0424] In this context, "aircraft" generally refers to any device that flies within or outside the atmosphere (space), including both atmospheric aircraft and spacecraft. Aircraft can include airplanes, airships, etc., and for example, low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional jets, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. For example, an aircraft could be a cargo drone.

[0425] The battery device 100 is installed on the aircraft and is used to provide electrical power to the aircraft. The battery device 100 includes a housing assembly 2 and a battery cell array 1. The housing forms a receiving cavity, and a cover can be connected to the housing assembly 2 to seal the receiving cavity. The battery cell array 1 is disposed in the receiving cavity.

[0426] The battery cell array 1 includes at least two battery cell groups 10, each battery cell group 10 including multiple battery cells 11. The at least two battery cell groups 10 are arranged sequentially along a second direction. Multiple battery cells 11 in the same battery cell group 10 are arranged along a first direction. The battery cells 11 are approximately cuboid in shape, and the surface of the battery cell 11 with the largest area is perpendicular to the first direction. The height direction of the battery cells 11 is set along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0427] The housing assembly 2 is approximately a cuboid structure, including a first wall 22, two side plates 23 and two side beams 21. The first wall 22 is used to support the battery cell array 1. The two side beams 21 are arranged on opposite sides of the first wall 22 along a first direction. The two side plates 23 are arranged on opposite sides of the first wall 22 along a second direction. Both the side plates 23 and the side beams 21 are connected to the first wall 22. Adjacent side plates 23 are connected to the side beams 21.

[0428] The first wall 22 includes an insulating structural layer 2a and a fiber composite material layer 2b stacked along a third direction, with the insulating structural layer 2a located on the side of the first wall 22 facing the battery cell 11; the side beam 21 includes an insulating structural layer 2a and a fiber composite material layer 2b stacked at least along a first direction, with the insulating structural layer 2a located on the side of the side beam 21 facing the battery cell 11, and in the beam member, the insulating structural layer 2a and the fiber composite material layer 2b form a butt joint or lap joint connection structure on the side of the side beam 21 away from the receiving cavity; the side plate 23 includes an insulating structural layer 2a and a fiber composite material layer 2b stacked at least along a second direction, with the insulating structural layer 2a located on the side of the side plate 23 facing the battery cell 11, and in the side plate 23, the insulating structural layer 2a and the fiber composite material layer 2b form an lap joint connection structure on the side of the side plate 23 member away from the first wall 22.

[0429] In some specific embodiments, the insulating structural layer 2a of the first wall 22, the insulating structural layer 2a of the side beam 21, and the insulating structural layer 2a of the side plate 23 are formed as an integral structure, and the fiber composite material layer 2b of the first wall 22, the fiber composite material layer 2b of the side beam 21, and the fiber composite material layer 2b of the side plate 23 are formed as an integral structure.

[0430] The side beam 21 includes a first plate 211 and a support structure 212. The first plate 211 is used to constrain the battery cell group 10. The support structure 212 abuts against the first plate 211 from the side opposite to the battery cell 11 along a first direction. The first plate 211 is a fiber composite material plate.

[0431] Specifically, at least a portion of the first plate 211 is formed by an insulating structural layer 2a, a hollow cavity 21a is formed between the fiber composite material layer 2b of the side beam 21 and the insulating layer, and a support structure 212 is disposed within the hollow cavity 21a.

[0432] The support structure 212 includes a first support body 213, which has a support plate 2131 facing the first plate 211. The first direction is the thickness direction of the support plate 2131, and the support plate 2131 abuts against the first plate 211 along the first direction.

[0433] The first support 213 also includes an extension plate 2132 connected to the support plate 2131. The extension plate 2132 is connected to the side of the support plate 2131 facing the battery cell 11 and extends along the first direction. The extension plate 2132 is connected to the first wall 22 and projects onto the same projection plane along the thickness direction of the first wall 22. The projection of the extension plate 2132 overlaps with the projection of at least a portion of the battery cell 11.

[0434] In some specific embodiments, the extension plate 2132 is located between the insulating structural layer 2a and the fiber composite material layer 2b of the first wall 22. The battery cell 11 has a pressure relief mechanism 111, and the battery cell 11 is arranged such that the pressure relief port of the pressure relief mechanism 111 faces the first wall 22. The first wall 22 has a through hole 22a at a position corresponding to the pressure relief mechanism 111. The extension plate 2132 has a clearance notch 2132a, which is projected onto the same projection plane along the thickness direction of the first wall 22. The projection of the pressure relief port of the pressure relief mechanism 111 is located within the projection of the clearance notch 2132a and within the projection of the through hole 22a.

[0435] The first support 213 also includes a reinforcing structure 2133, which includes a first reinforcing rib 2133a. The first reinforcing rib 2133a extends along the thickness direction (i.e., the third direction) of the first wall 22. A top flange 2131a is formed at the end of the support plate 2131 facing away from the first wall 22. The top flange 2131a extends in a direction facing away from the battery cell 11 along a first direction. One end of the first reinforcing rib 2133a is connected to the top flange 2131a. The first support 213 also includes a connecting plate 2134, which is connected to the side of the first support plate 2131 facing away from the battery cell 11 along the first direction and extends along the first direction. The thickness direction of the connecting plate 2134 is the thickness direction of the first wall 22. The connecting plate 2134 is located on the side of the top flange 2131a closest to the first wall 22. The other end of the first reinforcing rib 2133a is connected to the connecting plate 2134. The angle α between the edge of the first reinforcing rib 2133a away from the support plate 2131 along the first direction and the surface of the connecting plate 2134 along the thickness direction (i.e., the third direction) is less than 90°.

[0436] Multiple first reinforcing ribs 2133a are spaced apart on the support plate 2131 along the second direction, which intersects with the first direction. Along the second direction, a battery cell 11 has two battery shoulders and a battery center. The battery center is connected to the two battery shoulders and located between the two battery shoulders. The distance between two adjacent first reinforcing ribs 2133a located in the battery center is t1, and the distance between two adjacent first reinforcing ribs 2133a located in the battery shoulders is t2, where t1 < t2.

[0437] The first support 213 includes a first fiber fabric and a first substrate. The first fiber fabric includes multiple first fibers. The first fibers include at least one of carbon fiber and polyethylene fiber; and / or the first substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0438] At least a portion of the first fiber fabric extends from the support plate 2131 to the extension plate 2132, and at least a portion of the first fiber fabric extends from the support plate 2131 to the reinforcing structure 2133.

[0439] The supporting structure 212 also includes a second support body 215, which is disposed between two adjacent first reinforcing ribs 2133a along the second direction. The side beam 21 includes a second plate 214, which is located on the side of the supporting structure 212 away from the first plate 211 along the first direction. The supporting structure 212 also includes a second support body 215, which is located between the supporting plate 2131 and the second plate 214. At least a portion of the second plate 214 is formed of a fiber composite material layer 2b.

[0440] The second support 215 abuts against the first reinforcing rib 2133a at both ends along the second direction; and / or the second support 215 abuts against the support plate 2131 and the second plate 214 at both ends along the first direction, respectively.

[0441] The second support 215 may include a foam layer, which may be one or more of polyurethane foam, polystyrene foam, polypropylene foam, or metal foam. Alternatively, the second support 215 may be configured as a fiber composite shell, which may be made of fiber-reinforced composite material and may include one or more chambers, each with an opening 215a facing the support plate 2131, so that the second support 215 and the first support 213 cooperate to form a structure that closes the chambers.

[0442] The reinforcing structure 2133 further includes a second reinforcing rib 2133b, which extends along a second direction and at least one end of the second reinforcing rib 2133b along the second direction is connected to the first reinforcing rib 2133a.

[0443] In some embodiments, the battery device 100 further includes a fiber composite tension plate 3, which includes a main body portion 3a and a connecting portion 3b. The connecting portion 3b is located at both ends of the main body portion 3a along a first direction and is connected to the side beam 21.

[0444] The fiber composite pull plate 3 includes at least one first pull plate 31, which covers at least a portion of the terminal posts 112 of the battery cell array 10 from the side opposite to the first wall 22. The fiber composite pull plate 3 includes at least two second pull plates 32, which cover both sides of the battery cell array 1 along the second direction.

[0445] The insulating structure layer 2a includes a second substrate and a second fiber fabric, and the fiber composite material layer 2b includes a third substrate and a third fiber fabric. The second fiber fabric includes multiple second fibers, and the third fiber fabric includes multiple third fibers. The second fibers are different from the third fibers.

[0446] The second fiber includes at least one of glass fiber, basalt fiber, and aramid fiber, and the third fiber includes at least one of carbon fiber and polyethylene fiber.

[0447] The second substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin, and the third substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0448] In the description of this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine different embodiments or examples described in this application, as well as features of different embodiments or examples.

[0449] The above are merely preferred embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A battery device, characterized in that, The battery device includes: A battery cell pack includes multiple battery cells stacked along a first direction; A housing assembly for defining a receiving cavity in which the battery cell assembly is disposed; The housing assembly includes two side beams arranged opposite each other along a first direction. Each side beam includes a first plate and a support structure. The first plate is used to constrain the battery cell assembly. The support structure abuts against the first plate from the side away from the battery cell along the first direction. The first plate is a fiber composite material plate.

2. The battery device according to claim 1, characterized in that, The support structure includes a first support body having a support plate facing the first plate, the first direction being the thickness direction of the support plate, and the support plate abutting against the first plate along the first direction.

3. The battery device according to claim 2, characterized in that, The housing assembly includes a first wall, two side beams connected to opposite ends of the first wall along the first direction, and the battery cells supported on the first wall. The first support also includes an extension plate connected to the support plate. The extension plate is connected to the side of the support plate facing the battery cell and extends along the first direction. The extension plate is connected to the first wall and projects onto the same projection plane along the thickness direction of the first wall. The projection of the extension plate overlaps with the projection of at least a portion of the battery cell.

4. The battery device according to claim 2 or 3, characterized in that, The first support also includes a reinforcing structure disposed on the side of the support plate opposite to the battery cell along the first direction.

5. The battery device according to claim 2 or 3, characterized in that, The side beam includes a second plate located on the side of the support plate opposite to the first plate along the first direction. The support structure also includes a second support body located between the support plate and the second plate. The second support includes a foam layer; or, The second support is configured as a fiber composite shell with an opening at at least one end, the opening facing the support plate.

6. The battery device according to claim 2 or 3, characterized in that, Multiple battery cell groups are arranged along a second direction to form a battery cell array, the second direction intersecting the first direction; The support plate extends along the second direction to the opposite ends of the side beam along the second direction.

7. The battery device according to claim 2 or 3, characterized in that, Multiple battery cell groups are arranged along a second direction to form a battery cell array, the second direction intersecting the first direction; The plurality of support plates are spaced apart along the second direction.

8. The battery device according to claim 7, characterized in that, Projecting along the first direction onto the same projection plane, the splicing area of ​​the projections of two adjacent battery cell groups is covered by the projection of one of the support plates.

9. The battery device according to claim 3, characterized in that, The first wall includes an insulating structural layer and a fiber composite material layer stacked together. Along the thickness direction of the first wall, the insulating structural layer is located between the fiber composite material layer and the battery cell, and the extension plate is located between the insulating structural layer and the fiber composite material layer of the first wall.

10. The battery device according to claim 3 or 9, characterized in that, The battery cell has a pressure relief mechanism, and the battery cell is arranged such that the pressure relief port of the pressure relief mechanism faces the first wall. The first wall has a through hole at a position corresponding to the pressure relief mechanism. The extension plate has a clearance notch that projects onto the same projection plane along the thickness direction of the first wall. The projection of the pressure relief port of the pressure relief mechanism is located within the projection of the clearance notch and within the projection of the through hole.

11. The battery device according to claim 4, characterized in that, The housing assembly includes a first wall, the battery cell is supported on the first wall, and the reinforcing structure includes a first reinforcing rib extending along the thickness direction of the first wall.

12. The battery device according to claim 11, characterized in that, The end of the support plate opposite to the first wall forms a top flange, which extends in a direction opposite to the battery cell along the first direction. One end of the first reinforcing rib is connected to the top flange.

13. The battery device according to claim 12, characterized in that, The first support further includes a connecting plate, which is connected to the support plate on the side opposite to the battery cell along the first direction and extends along the first direction. The thickness direction of the connecting plate is the same as the thickness direction of the first wall. The connecting plate is located on the side of the top flange near the first wall, and the other end of the first reinforcing rib is connected to the connecting plate.

14. The battery device according to claim 13, characterized in that, The angle between the edge of the first reinforcing rib away from the support plate along the first direction and the surface of the connecting plate along the thickness direction is less than 90°.

15. The battery device according to claim 13 or 14, characterized in that, The housing assembly also includes a mounting plate, which is located on the side of the side beam away from the battery cell and is spaced apart from and opposite to the side beam along the first direction. The connecting plate is connected to the mounting plate.

16. The battery device according to any one of claims 11 to 14, characterized in that, Multiple first reinforcing ribs are spaced apart on the support plate along a second direction, which intersects with the first direction. Along the second direction, a battery cell has two battery shoulders and a battery center. The battery center is connected to the two battery shoulders and located between them. The distance between two adjacent first reinforcing ribs in the battery center is t1, and the distance between two adjacent first reinforcing ribs in the battery shoulders is t2, where t1 < t2.

17. The battery device according to any one of claims 11 to 14, characterized in that, The reinforcing structure includes a second reinforcing rib extending along a second direction that intersects with the first direction, and at least one end of the second reinforcing rib along the second direction is connected to the first reinforcing rib.

18. The battery device according to any one of claims 11 to 14, characterized in that, The side beam includes a second plate located on the side of the support structure opposite to the first plate along the first direction. The support structure also includes a second support body located between the support plate and the second plate. A plurality of first reinforcing ribs are spaced apart on the support plate along a second direction, which intersects with the first direction. The second support body is arranged between two adjacent first reinforcing ribs along the second direction.

19. The battery device according to claim 18, characterized in that, The second support body abuts against the first reinforcing rib at both ends along the second direction; and / or The second support body abuts against the support plate and the second plate at both ends along the first direction, respectively.

20. The battery device according to claim 2, characterized in that, The first support includes a first fiber fabric and a first substrate, wherein the first fiber fabric includes a plurality of first fibers; The first fiber includes at least one of carbon fiber and polyethylene fiber; and / or The first substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

21. The battery device according to claim 20, characterized in that, The first support also includes an extension plate connected to the support plate. The extension plate is connected to the side of the support plate facing the battery cell and extends along the first direction. At least a portion of the first fiber fabric extends from the support plate to the extension plate.

22. The battery device according to claim 20 or 21, characterized in that, The first support further includes a reinforcing structure disposed on the side of the support plate opposite to the battery cell along the first direction, and at least a portion of the first fiber fabric extends from the support plate to the reinforcing structure.

23. The battery device according to claim 1, characterized in that, The battery device also includes: A fiber composite sheet, comprising a main body and a connecting part, wherein the connecting part is located at both ends of the main body along a first direction and is connected to the side beam.

24. The battery device according to claim 23, characterized in that, The housing assembly includes a first wall, the battery cell is supported on the first wall, and the side beams are connected to opposite ends of the first wall along the first direction; The fiber composite sheet includes at least one first sheet that covers at least a portion of the terminal posts of the battery cell assembly from the side of the battery cell assembly away from the first wall.

25. The battery device according to claim 23 or 24, characterized in that, The fiber composite sheet includes at least one second sheet, which covers at least a portion of the battery cell assembly along a second direction, the second direction intersecting the first direction.

26. The battery device according to claim 1, characterized in that, The side beam includes a laminated insulating structure layer and a fiber composite material layer, with at least a portion of the insulating structure layer located between the fiber composite material layer and the battery cell, and at least a portion of the first plate being formed by the insulating structure layer.

27. The battery device according to claim 26, characterized in that, A hollow cavity is formed between the insulating structure layer and the fiber composite material layer, and the supporting structure is located in the hollow cavity and abuts against the insulating structure layer.

28. The battery device according to claim 26, characterized in that, A portion of the insulating structural layer of the side beam is configured as a flange, which is connected to the composite material layer to form a connecting layer.

29. The battery device according to claim 28, characterized in that, The housing assembly includes a first wall, the battery cell is supported on the first wall, and the side beams are connected to opposite ends of the first wall along the first direction; The connecting layer is located at the end of the side beam on the side opposite to the first wall along the thickness direction of the first wall, or... The connecting layer is located on the side of the side beam opposite to the battery cell along the first direction.

30. The battery device according to claim 28, characterized in that, In the connecting layer, the flanged portion overlaps with the fiber composite material layer, or the flanged portion is butt-jointed with the fiber composite material layer.

31. The battery device according to claim 30, characterized in that, The housing assembly further includes an overlap layer, in which the flanged portion is mated to the fiber composite material layer, and the overlap layer at least covers the mating seam between the flanged portion and the fiber composite material layer.

32. The battery device according to any one of claims 26 to 31, characterized in that, The insulating structure layer includes a second fiber fabric, and the fiber composite material layer includes a third fiber fabric. The second fiber fabric includes multiple second fibers, and the third fiber fabric includes multiple third fibers. The second fibers are different from the third fibers.

33. The battery device according to claim 32, characterized in that, The second fiber includes at least one of glass fiber, basalt fiber, and aramid fiber; and / or, The third fiber includes at least one of carbon fiber and polyethylene fiber.

34. The battery device according to claim 32, characterized in that, The number of layers of the first fiber fabric in the insulating structure layer is less than or equal to the number of layers of the second fiber fabric in the composite material layer.

35. The battery device according to claim 1, characterized in that, The housing assembly includes two side plates arranged opposite each other along a second direction, the side plates constraining the battery cell assembly. The second direction intersects the first direction, and the side beams are respectively connected to the two side plates at opposite ends along the second direction. The side plate includes a laminated insulating structure layer and a fiber composite material layer, wherein the insulating structure layer is located between the fiber composite material layer and the battery cell along the second direction.

36. The battery device according to claim 35, characterized in that, The side plate is configured as a hollow structure with a hollow cavity, which is located between the insulating structure layer and the fiber composite material layer of the side plate.

37. The battery device according to claim 36, characterized in that, The side plate further includes a third support, which is located within the hollow cavity of the side plate and abuts against at least one of the insulating structural layer and the fiber composite material layer.

38. An electrical appliance, characterized in that, The electrical equipment includes the battery device according to any one of claims 1-37.

39. The electrical equipment according to claim 38, characterized in that, The electrical equipment includes aircraft.

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